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dageyra
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Joined: 22 Feb 2005
Posts: 194
Location: Terre Haute, IN

PostPosted: Tue Aug 05, 2014 7:23 pm    Post subject: Postfix server allows sending from non-existing users Reply with quote

We've had our mail server blacklisted and in reviewing the issue we realize that the postfix server is not an open relay but seems to allow mail sent from a non-existing user. For example, it will reject user@domain.com because it's a relay, but if domain.com is one of the domains on which we receive and send mail, even if "user" is not a user on the system, it will send mail without authentication.

Here's some info:

Code:

mail log # grep D51AF236F10 maillog
Aug  5 15:11:10 mail postfix/smtpd[2760]: D51AF236F10: client=server[65.111.253.235]
Aug  5 15:11:11 mail postfix/cleanup[2754]: D51AF236F10: message-id=<>
Aug  5 15:11:11 mail postfix/qmgr[14000]: D51AF236F10: from=<support@domain.com>, size=4011, nrcpt=1 (queue active)
Aug  5 15:11:12 mail postfix/smtp[2766]: D51AF236F10: to=<TO@live.com>, relay=mx3.hotmail.com[65.54.188.110]:25, delay=1.9, delays=1/0/0.66/0.23, dsn=2.0.0, status=sent (250 <BAY004-MC3F34xubfed00a9015d@BAY004-MC3F34.hotmail.com> Queued mail for delivery)
Aug  5 15:11:12 mail postfix/qmgr[14000]: D51AF236F10: removed


Code:

mail log # passwd support
passwd: user 'support' does not exist


Note that in this case, postfix accepted email from "support@domain.com", though the user "support" does not exist. Note that if @domain.com was not a valid domain, it would not have allowed it (I've checked and confirmed it's not running as an open relay).

So the question is why is this allowed in our configuration. Something must be amiss but I'm not sure what it is. Here is our postfix main.cf:

Code:

queue_directory = /var/spool/postfix

command_directory = /usr/sbin

daemon_directory = /usr/libexec/postfix

data_directory = /var/lib/postfix

mail_owner = postfix

smtp_bind_address=123.123.123.123
myhostname = mail.domain.com
mydomain = domain.com
myorigin = $mydomain

inet_interfaces = all

mydestination = $myhostname, localhost.$myhostname, $mydomain

local_recipient_maps = unix:passwd.byname $alias_maps

unknown_local_recipient_reject_code = 550

alias_maps = hash:/etc/postfix/aliases, hash:/usr/local/mailman/data/aliases
virtual_alias_maps = hash:/etc/postfix/virtual_maps, hash:/usr/local/mailman/data/virtual-mailman
alias_database = hash:/etc/postfix/aliases, hash:/usr/local/mailman/data/aliases

recipient_delimiter = +

home_mailbox = Maildir/

mailbox_command = /usr/bin/procmail

smtpd_banner = $myhostname ESMTP

debug_peer_level = 2

debugger_command =
         PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
         xxgdb $daemon_directory/$process_name $process_id & sleep 5

sendmail_path = /usr/sbin/sendmail

newaliases_path = /usr/bin/newaliases

mailq_path = /usr/bin/mailq

setgid_group = postdrop

readme_directory = no

# tls stuff
smtp_use_tls = yes
smtpd_use_tls = yes
smtpd_tls_key_file = /etc/ssl/postfix/server.pem
smtpd_tls_cert_file = /etc/ssl/postfix/server.pem
smtpd_tls_CAfile = /etc/ssl/postfix/server.pem

# sasl stuff
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = domain.com
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated, reject_unauth_destination, check_policy_service inet:127.0.0.1:10030
smtpd_relay_restrictions =
smtpd_sasl_security_options = noanonymous
smtpd_sasl_authenticated_header = yes

# virtual hosts
virtual_alias_domains = ALL_DOMAINS

message_size_limit = 20480000


Thanks for any advice you can offer.
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dageyra
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Joined: 22 Feb 2005
Posts: 194
Location: Terre Haute, IN

PostPosted: Tue Aug 05, 2014 7:30 pm    Post subject: Reply with quote

I found this setting smtpd_reject_unlisted_sender (default: no) in the postfix docs. It's not located anywhere in my file and I see the default setting is no.

If I change this to yes, it would prevent the server from sending on behalf of non-existent addresses? Why would it be set to no in the first place? Is there a better way to achieve what we need?
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papahuhn
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Joined: 06 Sep 2004
Posts: 606

PostPosted: Wed Aug 06, 2014 6:25 am    Post subject: Reply with quote

Can you post your master.cf and postconf output, please?
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freke
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Joined: 23 Jan 2003
Posts: 164

PostPosted: Wed Aug 06, 2014 6:36 am    Post subject: Re: Postfix server allows sending from non-existing users Reply with quote

dageyra wrote:
# sasl stuff
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = domain.com
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated, reject_unauth_destination, check_policy_service inet:127.0.0.1:10030
smtpd_relay_restrictions =
smtpd_sasl_security_options = noanonymous
smtpd_sasl_authenticated_header = yes


Not quite sure if that's causing it, but isn't a comma missing in the smtpd_recipient_restrictions-line (between permit_mynetworks and permit_sasl_authenticated?
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khayyam
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Joined: 07 Jun 2012
Posts: 2950

PostPosted: Wed Aug 06, 2014 12:29 pm    Post subject: Re: Postfix server allows sending from non-existing users Reply with quote

freke wrote:
Not quite sure if that's causing it, but isn't a comma missing in the smtpd_recipient_restrictions-line (between permit_mynetworks and permit_sasl_authenticated?

freke ... it shouldn't have any effect, postfix accepts comma or space as parameter seperator.

@dageyra ... as papahuhn suggested you should post the output of postconf.

best ... khay
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dageyra
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Joined: 22 Feb 2005
Posts: 194
Location: Terre Haute, IN

PostPosted: Wed Aug 06, 2014 1:28 pm    Post subject: Reply with quote

papahuhn wrote:
Can you post your master.cf and postconf output, please?


Sure, but it should be noted that I added the smtpd_reject_unlisted_sender line and set to yes, and now only users that are authenticated can send mail (support@domain.com is rejected). I have determined why this is off by default, when some of our web scripts send email from noreply@domain.com, that is also not allowed. Not sure if there's a happy middle there, or if it's just one or the other. We could always implement one of the free-ish online services that can route mail and bypass sending from the mail server directly.

Code:

# postconf
2bounce_notice_recipient = postmaster
access_map_defer_code = 450
access_map_reject_code = 554
address_verify_cache_cleanup_interval = 12h
address_verify_default_transport = $default_transport
address_verify_local_transport = $local_transport
address_verify_map = btree:$data_directory/verify_cache
address_verify_negative_cache = yes
address_verify_negative_expire_time = 3d
address_verify_negative_refresh_time = 3h
address_verify_poll_count = ${stress?1}${stress:3}
address_verify_poll_delay = 3s
address_verify_positive_expire_time = 31d
address_verify_positive_refresh_time = 7d
address_verify_relay_transport = $relay_transport
address_verify_relayhost = $relayhost
address_verify_sender = $double_bounce_sender
address_verify_sender_dependent_default_transport_maps = $sender_dependent_default_transport_maps
address_verify_sender_dependent_relayhost_maps = $sender_dependent_relayhost_maps
address_verify_sender_ttl = 0s
address_verify_service_name = verify
address_verify_transport_maps = $transport_maps
address_verify_virtual_transport = $virtual_transport
alias_database = hash:/etc/postfix/aliases, hash:/usr/local/mailman/data/aliases
alias_maps = hash:/etc/postfix/aliases, hash:/usr/local/mailman/data/aliases
allow_mail_to_commands = alias, forward
allow_mail_to_files = alias, forward
allow_min_user = no
allow_percent_hack = yes
allow_untrusted_routing = no
alternate_config_directories =
always_add_missing_headers = no
always_bcc =
anvil_rate_time_unit = 60s
anvil_status_update_time = 600s
append_at_myorigin = yes
append_dot_mydomain = yes
application_event_drain_time = 100s
authorized_flush_users = static:anyone
authorized_mailq_users = static:anyone
authorized_submit_users = static:anyone
backwards_bounce_logfile_compatibility = yes
berkeley_db_create_buffer_size = 16777216
berkeley_db_read_buffer_size = 131072
best_mx_transport =
biff = yes
body_checks =
body_checks_size_limit = 51200
bounce_notice_recipient = postmaster
bounce_queue_lifetime = 5d
bounce_service_name = bounce
bounce_size_limit = 50000
bounce_template_file =
broken_sasl_auth_clients = yes
canonical_classes = envelope_sender, envelope_recipient, header_sender, header_recipient
canonical_maps =
cleanup_service_name = cleanup
command_directory = /usr/sbin
command_execution_directory =
command_expansion_filter = 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
command_time_limit = 1000s
config_directory = /etc/postfix
connection_cache_protocol_timeout = 5s
connection_cache_service_name = scache
connection_cache_status_update_time = 600s
connection_cache_ttl_limit = 2s
content_filter =
cyrus_sasl_config_path =
daemon_directory = /usr/libexec/postfix
daemon_table_open_error_is_fatal = no
daemon_timeout = 18000s
data_directory = /var/lib/postfix
debug_peer_level = 2
debug_peer_list =
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin xxgdb $daemon_directory/$process_name $process_id & sleep 5
default_database_type = hash
default_delivery_slot_cost = 5
default_delivery_slot_discount = 50
default_delivery_slot_loan = 3
default_destination_concurrency_failed_cohort_limit = 1
default_destination_concurrency_limit = 20
default_destination_concurrency_negative_feedback = 1
default_destination_concurrency_positive_feedback = 1
default_destination_rate_delay = 0s
default_destination_recipient_limit = 50
default_extra_recipient_limit = 1000
default_filter_nexthop =
default_minimum_delivery_slots = 3
default_privs = nobody
default_process_limit = 100
default_rbl_reply = $rbl_code Service unavailable; $rbl_class [$rbl_what] blocked using $rbl_domain${rbl_reason?; $rbl_reason}
default_recipient_limit = 20000
default_recipient_refill_delay = 5s
default_recipient_refill_limit = 100
default_transport = smtp
default_verp_delimiters = +=
defer_code = 450
defer_service_name = defer
defer_transports =
delay_logging_resolution_limit = 2
delay_notice_recipient = postmaster
delay_warning_time = 0h
deliver_lock_attempts = 20
deliver_lock_delay = 1s
destination_concurrency_feedback_debug = no
detect_8bit_encoding_header = yes
disable_dns_lookups = no
disable_mime_input_processing = no
disable_mime_output_conversion = no
disable_verp_bounces = no
disable_vrfy_command = no
dnsblog_reply_delay = 0s
dnsblog_service_name = dnsblog
dont_remove = 0
double_bounce_sender = double-bounce
duplicate_filter_limit = 1000
empty_address_default_transport_maps_lookup_key = <>
empty_address_recipient = MAILER-DAEMON
empty_address_relayhost_maps_lookup_key = <>
enable_long_queue_ids = no
enable_original_recipient = yes
error_delivery_slot_cost = $default_delivery_slot_cost
error_delivery_slot_discount = $default_delivery_slot_discount
error_delivery_slot_loan = $default_delivery_slot_loan
error_destination_concurrency_failed_cohort_limit = $default_destination_concurrency_failed_cohort_limit
error_destination_concurrency_limit = $default_destination_concurrency_limit
error_destination_concurrency_negative_feedback = $default_destination_concurrency_negative_feedback
error_destination_concurrency_positive_feedback = $default_destination_concurrency_positive_feedback
error_destination_rate_delay = $default_destination_rate_delay
error_destination_recipient_limit = $default_destination_recipient_limit
error_extra_recipient_limit = $default_extra_recipient_limit
error_initial_destination_concurrency = $initial_destination_concurrency
error_minimum_delivery_slots = $default_minimum_delivery_slots
error_notice_recipient = postmaster
error_recipient_limit = $default_recipient_limit
error_recipient_refill_delay = $default_recipient_refill_delay
error_recipient_refill_limit = $default_recipient_refill_limit
error_service_name = error
execution_directory_expansion_filter = 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
expand_owner_alias = no
export_environment = TZ MAIL_CONFIG LANG
fallback_transport =
fallback_transport_maps =
fast_flush_domains = $relay_domains
fast_flush_purge_time = 7d
fast_flush_refresh_time = 12h
fault_injection_code = 0
flush_service_name = flush
fork_attempts = 5
fork_delay = 1s
forward_expansion_filter = 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
forward_path = $home/.forward${recipient_delimiter}${extension}, $home/.forward
frozen_delivered_to = yes
hash_queue_depth = 1
hash_queue_names = deferred, defer
header_address_token_limit = 10240
header_checks =
header_size_limit = 102400
helpful_warnings = yes
home_mailbox = Maildir/
hopcount_limit = 50
html_directory = no
ignore_mx_lookup_error = no
import_environment = MAIL_CONFIG MAIL_DEBUG MAIL_LOGTAG TZ XAUTHORITY DISPLAY LANG=C
in_flow_delay = 1s
inet_interfaces = all
inet_protocols = all
initial_destination_concurrency = 5
internal_mail_filter_classes =
invalid_hostname_reject_code = 501
ipc_idle = 5s
ipc_timeout = 3600s
ipc_ttl = 1000s
line_length_limit = 2048
lmtp_address_preference = any
lmtp_assume_final = no
lmtp_bind_address =
lmtp_bind_address6 =
lmtp_body_checks =
lmtp_cname_overrides_servername = no
lmtp_connect_timeout = 0s
lmtp_connection_cache_destinations =
lmtp_connection_cache_on_demand = yes
lmtp_connection_cache_time_limit = 2s
lmtp_connection_reuse_time_limit = 300s
lmtp_data_done_timeout = 600s
lmtp_data_init_timeout = 120s
lmtp_data_xfer_timeout = 180s
lmtp_defer_if_no_mx_address_found = no
lmtp_delivery_slot_cost = $default_delivery_slot_cost
lmtp_delivery_slot_discount = $default_delivery_slot_discount
lmtp_delivery_slot_loan = $default_delivery_slot_loan
lmtp_destination_concurrency_failed_cohort_limit = $default_destination_concurrency_failed_cohort_limit
lmtp_destination_concurrency_limit = $default_destination_concurrency_limit
lmtp_destination_concurrency_negative_feedback = $default_destination_concurrency_negative_feedback
lmtp_destination_concurrency_positive_feedback = $default_destination_concurrency_positive_feedback
lmtp_destination_rate_delay = $default_destination_rate_delay
lmtp_destination_recipient_limit = $default_destination_recipient_limit
lmtp_discard_lhlo_keyword_address_maps =
lmtp_discard_lhlo_keywords =
lmtp_dns_resolver_options =
lmtp_enforce_tls = no
lmtp_extra_recipient_limit = $default_extra_recipient_limit
lmtp_generic_maps =
lmtp_header_checks =
lmtp_host_lookup = dns
lmtp_initial_destination_concurrency = $initial_destination_concurrency
lmtp_lhlo_name = $myhostname
lmtp_lhlo_timeout = 300s
lmtp_line_length_limit = 998
lmtp_mail_timeout = 300s
lmtp_mime_header_checks =
lmtp_minimum_delivery_slots = $default_minimum_delivery_slots
lmtp_mx_address_limit = 5
lmtp_mx_session_limit = 2
lmtp_nested_header_checks =
lmtp_per_record_deadline = no
lmtp_pix_workaround_delay_time = 10s
lmtp_pix_workaround_maps =
lmtp_pix_workaround_threshold_time = 500s
lmtp_pix_workarounds = disable_esmtp,delay_dotcrlf
lmtp_quit_timeout = 300s
lmtp_quote_rfc821_envelope = yes
lmtp_randomize_addresses = yes
lmtp_rcpt_timeout = 300s
lmtp_recipient_limit = $default_recipient_limit
lmtp_recipient_refill_delay = $default_recipient_refill_delay
lmtp_recipient_refill_limit = $default_recipient_refill_limit
lmtp_reply_filter =
lmtp_rset_timeout = 20s
lmtp_sasl_auth_cache_name =
lmtp_sasl_auth_cache_time = 90d
lmtp_sasl_auth_enable = no
lmtp_sasl_auth_soft_bounce = yes
lmtp_sasl_mechanism_filter =
lmtp_sasl_password_maps =
lmtp_sasl_path =
lmtp_sasl_security_options = noplaintext, noanonymous
lmtp_sasl_tls_security_options = $lmtp_sasl_security_options
lmtp_sasl_tls_verified_security_options = $lmtp_sasl_tls_security_options
lmtp_sasl_type = cyrus
lmtp_send_dummy_mail_auth = no
lmtp_send_xforward_command = no
lmtp_sender_dependent_authentication = no
lmtp_skip_5xx_greeting = yes
lmtp_skip_quit_response = no
lmtp_starttls_timeout = 300s
lmtp_tcp_port = 24
lmtp_tls_CAfile =
lmtp_tls_CApath =
lmtp_tls_block_early_mail_reply = no
lmtp_tls_cert_file =
lmtp_tls_ciphers = export
lmtp_tls_dcert_file =
lmtp_tls_dkey_file = $lmtp_tls_dcert_file
lmtp_tls_eccert_file =
lmtp_tls_eckey_file = $lmtp_tls_eccert_file
lmtp_tls_enforce_peername = yes
lmtp_tls_exclude_ciphers =
lmtp_tls_fingerprint_cert_match =
lmtp_tls_fingerprint_digest = md5
lmtp_tls_key_file = $lmtp_tls_cert_file
lmtp_tls_loglevel = 0
lmtp_tls_mandatory_ciphers = medium
lmtp_tls_mandatory_exclude_ciphers =
lmtp_tls_mandatory_protocols = !SSLv2
lmtp_tls_note_starttls_offer = no
lmtp_tls_per_site =
lmtp_tls_policy_maps =
lmtp_tls_protocols = !SSLv2
lmtp_tls_scert_verifydepth = 9
lmtp_tls_secure_cert_match = nexthop
lmtp_tls_security_level =
lmtp_tls_session_cache_database =
lmtp_tls_session_cache_timeout = 3600s
lmtp_tls_verify_cert_match = hostname
lmtp_use_tls = no
lmtp_xforward_timeout = 300s
local_command_shell =
local_delivery_slot_cost = $default_delivery_slot_cost
local_delivery_slot_discount = $default_delivery_slot_discount
local_delivery_slot_loan = $default_delivery_slot_loan
local_destination_concurrency_failed_cohort_limit = $default_destination_concurrency_failed_cohort_limit
local_destination_concurrency_limit = 2
local_destination_concurrency_negative_feedback = $default_destination_concurrency_negative_feedback
local_destination_concurrency_positive_feedback = $default_destination_concurrency_positive_feedback
local_destination_rate_delay = $default_destination_rate_delay
local_destination_recipient_limit = 1
local_extra_recipient_limit = $default_extra_recipient_limit
local_header_rewrite_clients = permit_inet_interfaces
local_initial_destination_concurrency = $initial_destination_concurrency
local_minimum_delivery_slots = $default_minimum_delivery_slots
local_recipient_limit = $default_recipient_limit
local_recipient_maps = unix:passwd.byname $alias_maps
local_recipient_refill_delay = $default_recipient_refill_delay
local_recipient_refill_limit = $default_recipient_refill_limit
local_transport = local:$myhostname
luser_relay =
mail_name = Postfix
mail_owner = postfix
mail_release_date = 20130211
mail_spool_directory = /var/mail
mail_version = 2.10.0
mailbox_command = /usr/bin/procmail
mailbox_command_maps =
mailbox_delivery_lock = fcntl, dotlock
mailbox_size_limit = 51200000
mailbox_transport =
mailbox_transport_maps =
mailq_path = /usr/bin/mailq
manpage_directory = /usr/local/man
maps_rbl_domains =
maps_rbl_reject_code = 554
masquerade_classes = envelope_sender, header_sender, header_recipient
masquerade_domains =
masquerade_exceptions =
master_service_disable =
max_idle = 100s
max_use = 100
maximal_backoff_time = 4000s
maximal_queue_lifetime = 5d
message_reject_characters =
message_size_limit = 20480000
message_strip_characters =
milter_command_timeout = 30s
milter_connect_macros = j {daemon_name} v
milter_connect_timeout = 30s
milter_content_timeout = 300s
milter_data_macros = i
milter_default_action = tempfail
milter_end_of_data_macros = i
milter_end_of_header_macros = i
milter_header_checks =
milter_helo_macros = {tls_version} {cipher} {cipher_bits} {cert_subject} {cert_issuer}
milter_macro_daemon_name = $myhostname
milter_macro_v = $mail_name $mail_version
milter_mail_macros = i {auth_type} {auth_authen} {auth_author} {mail_addr} {mail_host} {mail_mailer}
milter_protocol = 6
milter_rcpt_macros = i {rcpt_addr} {rcpt_host} {rcpt_mailer}
milter_unknown_command_macros =
mime_boundary_length_limit = 2048
mime_header_checks = $header_checks
mime_nesting_limit = 100
minimal_backoff_time = 300s
multi_instance_directories =
multi_instance_enable = no
multi_instance_group =
multi_instance_name =
multi_instance_wrapper =
multi_recipient_bounce_reject_code = 550
mydestination = $myhostname, localhost.$myhostname, $mydomain
mydomain = domain.com
myhostname = mail.domain.com
mynetworks = 127.0.0.0/8 123.123.123.123/29 [::1]/128 [fe80::]/64
mynetworks_style = subnet
myorigin = $mydomain
nested_header_checks = $header_checks
newaliases_path = /usr/bin/newaliases
non_fqdn_reject_code = 504
non_smtpd_milters =
notify_classes = resource, software
owner_request_special = yes
parent_domain_matches_subdomains = debug_peer_list,fast_flush_domains,mynetworks,permit_mx_backup_networks,qmqpd_authorized_clients,relay_domains,smtpd_access_maps
permit_mx_backup_networks =
pickup_service_name = pickup
plaintext_reject_code = 450
postmulti_control_commands = reload flush
postmulti_start_commands = start
postmulti_stop_commands = stop abort drain quick-stop
postscreen_access_list = permit_mynetworks
postscreen_bare_newline_action = ignore
postscreen_bare_newline_enable = no
postscreen_bare_newline_ttl = 30d
postscreen_blacklist_action = ignore
postscreen_cache_cleanup_interval = 12h
postscreen_cache_map = btree:$data_directory/postscreen_cache
postscreen_cache_retention_time = 7d
postscreen_client_connection_count_limit = $smtpd_client_connection_count_limit
postscreen_command_count_limit = 20
postscreen_command_filter =
postscreen_command_time_limit = ${stress?10}${stress:300}s
postscreen_disable_vrfy_command = $disable_vrfy_command
postscreen_discard_ehlo_keyword_address_maps = $smtpd_discard_ehlo_keyword_address_maps
postscreen_discard_ehlo_keywords = $smtpd_discard_ehlo_keywords
postscreen_dnsbl_action = ignore
postscreen_dnsbl_reply_map =
postscreen_dnsbl_sites =
postscreen_dnsbl_threshold = 1
postscreen_dnsbl_ttl = 1h
postscreen_enforce_tls = $smtpd_enforce_tls
postscreen_expansion_filter = $smtpd_expansion_filter
postscreen_forbidden_commands = $smtpd_forbidden_commands
postscreen_greet_action = ignore
postscreen_greet_banner = $smtpd_banner
postscreen_greet_ttl = 1d
postscreen_greet_wait = ${stress?2}${stress:6}s
postscreen_helo_required = $smtpd_helo_required
postscreen_non_smtp_command_action = drop
postscreen_non_smtp_command_enable = no
postscreen_non_smtp_command_ttl = 30d
postscreen_pipelining_action = enforce
postscreen_pipelining_enable = no
postscreen_pipelining_ttl = 30d
postscreen_post_queue_limit = $default_process_limit
postscreen_pre_queue_limit = $default_process_limit
postscreen_reject_footer = $smtpd_reject_footer
postscreen_tls_security_level = $smtpd_tls_security_level
postscreen_upstream_proxy_protocol =
postscreen_upstream_proxy_timeout = 5s
postscreen_use_tls = $smtpd_use_tls
postscreen_watchdog_timeout = 10s
postscreen_whitelist_interfaces = static:all
prepend_delivered_header = command, file, forward
process_id = 8559
process_id_directory = pid
process_name = postconf
propagate_unmatched_extensions = canonical, virtual
proxy_interfaces =
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $smtpd_sender_login_maps $sender_bcc_maps $recipient_bcc_maps $smtp_generic_maps $lmtp_generic_maps $alias_maps
proxy_write_maps = $smtp_sasl_auth_cache_name $lmtp_sasl_auth_cache_name $address_verify_map $postscreen_cache_map
proxymap_service_name = proxymap
proxywrite_service_name = proxywrite
qmgr_clog_warn_time = 300s
qmgr_daemon_timeout = 1000s
qmgr_fudge_factor = 100
qmgr_ipc_timeout = 60s
qmgr_message_active_limit = 20000
qmgr_message_recipient_limit = 20000
qmgr_message_recipient_minimum = 10
qmqpd_authorized_clients =
qmqpd_client_port_logging = no
qmqpd_error_delay = 1s
qmqpd_timeout = 300s
queue_directory = /var/spool/postfix
queue_file_attribute_count_limit = 100
queue_minfree = 0
queue_run_delay = 300s
queue_service_name = qmgr
rbl_reply_maps =
readme_directory = no
receive_override_options =
recipient_bcc_maps =
recipient_canonical_classes = envelope_recipient, header_recipient
recipient_canonical_maps =
recipient_delimiter = +
reject_code = 554
reject_tempfail_action = defer_if_permit
relay_clientcerts =
relay_delivery_slot_cost = $default_delivery_slot_cost
relay_delivery_slot_discount = $default_delivery_slot_discount
relay_delivery_slot_loan = $default_delivery_slot_loan
relay_destination_concurrency_failed_cohort_limit = $default_destination_concurrency_failed_cohort_limit
relay_destination_concurrency_limit = $default_destination_concurrency_limit
relay_destination_concurrency_negative_feedback = $default_destination_concurrency_negative_feedback
relay_destination_concurrency_positive_feedback = $default_destination_concurrency_positive_feedback
relay_destination_rate_delay = $default_destination_rate_delay
relay_destination_recipient_limit = $default_destination_recipient_limit
relay_domains = $mydestination
relay_domains_reject_code = 554
relay_extra_recipient_limit = $default_extra_recipient_limit
relay_initial_destination_concurrency = $initial_destination_concurrency
relay_minimum_delivery_slots = $default_minimum_delivery_slots
relay_recipient_limit = $default_recipient_limit
relay_recipient_maps =
relay_recipient_refill_delay = $default_recipient_refill_delay
relay_recipient_refill_limit = $default_recipient_refill_limit
relay_transport = relay
relayhost =
relocated_maps =
remote_header_rewrite_domain =
require_home_directory = no
reset_owner_alias = no
resolve_dequoted_address = yes
resolve_null_domain = no
resolve_numeric_domain = no
retry_delivery_slot_cost = $default_delivery_slot_cost
retry_delivery_slot_discount = $default_delivery_slot_discount
retry_delivery_slot_loan = $default_delivery_slot_loan
retry_destination_concurrency_failed_cohort_limit = $default_destination_concurrency_failed_cohort_limit
retry_destination_concurrency_limit = $default_destination_concurrency_limit
retry_destination_concurrency_negative_feedback = $default_destination_concurrency_negative_feedback
retry_destination_concurrency_positive_feedback = $default_destination_concurrency_positive_feedback
retry_destination_rate_delay = $default_destination_rate_delay
retry_destination_recipient_limit = $default_destination_recipient_limit
retry_extra_recipient_limit = $default_extra_recipient_limit
retry_initial_destination_concurrency = $initial_destination_concurrency
retry_minimum_delivery_slots = $default_minimum_delivery_slots
retry_recipient_limit = $default_recipient_limit
retry_recipient_refill_delay = $default_recipient_refill_delay
retry_recipient_refill_limit = $default_recipient_refill_limit
rewrite_service_name = rewrite
sample_directory = /etc/postfix
send_cyrus_sasl_authzid = no
sender_bcc_maps =
sender_canonical_classes = envelope_sender, header_sender
sender_canonical_maps =
sender_dependent_default_transport_maps =
sender_dependent_relayhost_maps =
sendmail_fix_line_endings = always
sendmail_path = /usr/sbin/sendmail
service_throttle_time = 60s
setgid_group = postdrop
show_user_unknown_table_name = yes
showq_service_name = showq
smtp_address_preference = any
smtp_always_send_ehlo = yes
smtp_bind_address = 123.123.123.123
smtp_bind_address6 =
smtp_body_checks =
smtp_cname_overrides_servername = no
smtp_connect_timeout = 30s
smtp_connection_cache_destinations =
smtp_connection_cache_on_demand = yes
smtp_connection_cache_time_limit = 2s
smtp_connection_reuse_time_limit = 300s
smtp_data_done_timeout = 600s
smtp_data_init_timeout = 120s
smtp_data_xfer_timeout = 180s
smtp_defer_if_no_mx_address_found = no
smtp_delivery_slot_cost = $default_delivery_slot_cost
smtp_delivery_slot_discount = $default_delivery_slot_discount
smtp_delivery_slot_loan = $default_delivery_slot_loan
smtp_destination_concurrency_failed_cohort_limit = $default_destination_concurrency_failed_cohort_limit
smtp_destination_concurrency_limit = $default_destination_concurrency_limit
smtp_destination_concurrency_negative_feedback = $default_destination_concurrency_negative_feedback
smtp_destination_concurrency_positive_feedback = $default_destination_concurrency_positive_feedback
smtp_destination_rate_delay = $default_destination_rate_delay
smtp_destination_recipient_limit = $default_destination_recipient_limit
smtp_discard_ehlo_keyword_address_maps =
smtp_discard_ehlo_keywords =
smtp_dns_resolver_options =
smtp_enforce_tls = no
smtp_extra_recipient_limit = $default_extra_recipient_limit
smtp_fallback_relay = $fallback_relay
smtp_generic_maps =
smtp_header_checks =
smtp_helo_name = $myhostname
smtp_helo_timeout = 300s
smtp_host_lookup = dns
smtp_initial_destination_concurrency = $initial_destination_concurrency
smtp_line_length_limit = 998
smtp_mail_timeout = 300s
smtp_mime_header_checks =
smtp_minimum_delivery_slots = $default_minimum_delivery_slots
smtp_mx_address_limit = 5
smtp_mx_session_limit = 2
smtp_nested_header_checks =
smtp_never_send_ehlo = no
smtp_per_record_deadline = no
smtp_pix_workaround_delay_time = 10s
smtp_pix_workaround_maps =
smtp_pix_workaround_threshold_time = 500s
smtp_pix_workarounds = disable_esmtp,delay_dotcrlf
smtp_quit_timeout = 300s
smtp_quote_rfc821_envelope = yes
smtp_randomize_addresses = yes
smtp_rcpt_timeout = 300s
smtp_recipient_limit = $default_recipient_limit
smtp_recipient_refill_delay = $default_recipient_refill_delay
smtp_recipient_refill_limit = $default_recipient_refill_limit
smtp_reply_filter =
smtp_rset_timeout = 20s
smtp_sasl_auth_cache_name =
smtp_sasl_auth_cache_time = 90d
smtp_sasl_auth_enable = no
smtp_sasl_auth_soft_bounce = yes
smtp_sasl_mechanism_filter =
smtp_sasl_password_maps =
smtp_sasl_path =
smtp_sasl_security_options = noplaintext, noanonymous
smtp_sasl_tls_security_options = $smtp_sasl_security_options
smtp_sasl_tls_verified_security_options = $smtp_sasl_tls_security_options
smtp_sasl_type = cyrus
smtp_send_dummy_mail_auth = no
smtp_send_xforward_command = no
smtp_sender_dependent_authentication = no
smtp_skip_5xx_greeting = yes
smtp_skip_quit_response = yes
smtp_starttls_timeout = 300s
smtp_tls_CAfile =
smtp_tls_CApath =
smtp_tls_block_early_mail_reply = no
smtp_tls_cert_file =
smtp_tls_ciphers = export
smtp_tls_dcert_file =
smtp_tls_dkey_file = $smtp_tls_dcert_file
smtp_tls_eccert_file =
smtp_tls_eckey_file = $smtp_tls_eccert_file
smtp_tls_enforce_peername = yes
smtp_tls_exclude_ciphers =
smtp_tls_fingerprint_cert_match =
smtp_tls_fingerprint_digest = md5
smtp_tls_key_file = $smtp_tls_cert_file
smtp_tls_loglevel = 0
smtp_tls_mandatory_ciphers = medium
smtp_tls_mandatory_exclude_ciphers =
smtp_tls_mandatory_protocols = !SSLv2
smtp_tls_note_starttls_offer = no
smtp_tls_per_site =
smtp_tls_policy_maps =
smtp_tls_protocols = !SSLv2
smtp_tls_scert_verifydepth = 9
smtp_tls_secure_cert_match = nexthop, dot-nexthop
smtp_tls_security_level =
smtp_tls_session_cache_database =
smtp_tls_session_cache_timeout = 3600s
smtp_tls_verify_cert_match = hostname
smtp_use_tls = yes
smtp_xforward_timeout = 300s
smtpd_authorized_verp_clients = $authorized_verp_clients
smtpd_authorized_xclient_hosts =
smtpd_authorized_xforward_hosts =
smtpd_banner = $myhostname ESMTP
smtpd_client_connection_count_limit = 50
smtpd_client_connection_rate_limit = 0
smtpd_client_event_limit_exceptions = ${smtpd_client_connection_limit_exceptions:$mynetworks}
smtpd_client_message_rate_limit = 0
smtpd_client_new_tls_session_rate_limit = 0
smtpd_client_port_logging = no
smtpd_client_recipient_rate_limit = 0
smtpd_client_restrictions =
smtpd_command_filter =
smtpd_data_restrictions =
smtpd_delay_open_until_valid_rcpt = yes
smtpd_delay_reject = yes
smtpd_discard_ehlo_keyword_address_maps =
smtpd_discard_ehlo_keywords =
smtpd_end_of_data_restrictions =
smtpd_enforce_tls = no
smtpd_error_sleep_time = 1s
smtpd_etrn_restrictions =
smtpd_expansion_filter = \t\40!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~
smtpd_forbidden_commands = CONNECT GET POST
smtpd_hard_error_limit = ${stress?1}${stress:20}
smtpd_helo_required = no
smtpd_helo_restrictions =
smtpd_history_flush_threshold = 100
smtpd_junk_command_limit = ${stress?1}${stress:100}
smtpd_log_access_permit_actions =
smtpd_milters =
smtpd_noop_commands =
smtpd_null_access_lookup_key = <>
smtpd_peername_lookup = yes
smtpd_per_record_deadline = ${stress?yes}${stress:no}
smtpd_policy_service_max_idle = 300s
smtpd_policy_service_max_ttl = 1000s
smtpd_policy_service_timeout = 100s
smtpd_proxy_ehlo = $myhostname
smtpd_proxy_filter =
smtpd_proxy_options =
smtpd_proxy_timeout = 100s
smtpd_recipient_limit = 1000
smtpd_recipient_overshoot_limit = 1000
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated, reject_unauth_destination, check_policy_service inet:127.0.0.1:10030
smtpd_reject_footer =
smtpd_reject_unlisted_recipient = yes
smtpd_reject_unlisted_sender = yes
smtpd_relay_restrictions =
smtpd_restriction_classes =
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_sasl_exceptions_networks =
smtpd_sasl_local_domain = neoterichovercraft.com
smtpd_sasl_path = smtpd
smtpd_sasl_security_options = noanonymous
smtpd_sasl_tls_security_options = $smtpd_sasl_security_options
smtpd_sasl_type = cyrus
smtpd_sender_login_maps =
smtpd_sender_restrictions =
smtpd_service_name = smtpd
smtpd_soft_error_limit = 10
smtpd_starttls_timeout = ${stress?10}${stress:300}s
smtpd_timeout = ${stress?10}${stress:300}s
smtpd_tls_CAfile = /etc/ssl/postfix/server.pem
smtpd_tls_CApath =
smtpd_tls_always_issue_session_ids = yes
smtpd_tls_ask_ccert = no
smtpd_tls_auth_only = no
smtpd_tls_ccert_verifydepth = 9
smtpd_tls_cert_file = /etc/ssl/postfix/server.pem
smtpd_tls_ciphers = export
smtpd_tls_dcert_file =
smtpd_tls_dh1024_param_file =
smtpd_tls_dh512_param_file =
smtpd_tls_dkey_file = $smtpd_tls_dcert_file
smtpd_tls_eccert_file =
smtpd_tls_eckey_file = $smtpd_tls_eccert_file
smtpd_tls_eecdh_grade = strong
smtpd_tls_exclude_ciphers =
smtpd_tls_fingerprint_digest = md5
smtpd_tls_key_file = /etc/ssl/postfix/server.pem
smtpd_tls_loglevel = 0
smtpd_tls_mandatory_ciphers = medium
smtpd_tls_mandatory_exclude_ciphers =
smtpd_tls_mandatory_protocols = !SSLv2
smtpd_tls_protocols =
smtpd_tls_received_header = no
smtpd_tls_req_ccert = no
smtpd_tls_security_level =
smtpd_tls_session_cache_database =
smtpd_tls_session_cache_timeout = 3600s
smtpd_tls_wrappermode = no
smtpd_upstream_proxy_protocol =
smtpd_upstream_proxy_timeout = 5s
smtpd_use_tls = yes
soft_bounce = no
stale_lock_time = 500s
stress =
strict_7bit_headers = no
strict_8bitmime = no
strict_8bitmime_body = no
strict_mailbox_ownership = yes
strict_mime_encoding_domain = no
strict_rfc821_envelopes = no
sun_mailtool_compatibility = no
swap_bangpath = yes
syslog_facility = mail
syslog_name = ${multi_instance_name:postfix}${multi_instance_name?$multi_instance_name}
tcp_windowsize = 0
tls_append_default_CA = no
tls_daemon_random_bytes = 32
tls_disable_workarounds = CVE-2010-4180
tls_eecdh_strong_curve = prime256v1
tls_eecdh_ultra_curve = secp384r1
tls_export_cipherlist = aNULL:-aNULL:ALL:+RC4:@STRENGTH
tls_high_cipherlist = aNULL:-aNULL:ALL:!EXPORT:!LOW:!MEDIUM:+RC4:@STRENGTH
tls_legacy_public_key_fingerprints = no
tls_low_cipherlist = aNULL:-aNULL:ALL:!EXPORT:+RC4:@STRENGTH
tls_medium_cipherlist = aNULL:-aNULL:ALL:!EXPORT:!LOW:+RC4:@STRENGTH
tls_null_cipherlist = eNULL:!aNULL
tls_preempt_cipherlist = no
tls_random_bytes = 32
tls_random_exchange_name = ${data_directory}/prng_exch
tls_random_prng_update_period = 3600s
tls_random_reseed_period = 3600s
tls_random_source = dev:/dev/urandom
tlsproxy_enforce_tls = $smtpd_enforce_tls
tlsproxy_service_name = tlsproxy
tlsproxy_tls_CAfile = $smtpd_tls_CAfile
tlsproxy_tls_CApath = $smtpd_tls_CApath
tlsproxy_tls_always_issue_session_ids = $smtpd_tls_always_issue_session_ids
tlsproxy_tls_ask_ccert = $smtpd_tls_ask_ccert
tlsproxy_tls_ccert_verifydepth = $smtpd_tls_ccert_verifydepth
tlsproxy_tls_cert_file = $smtpd_tls_cert_file
tlsproxy_tls_ciphers = $smtpd_tls_ciphers
tlsproxy_tls_dcert_file = $smtpd_tls_dcert_file
tlsproxy_tls_dh1024_param_file = $smtpd_tls_dh1024_param_file
tlsproxy_tls_dh512_param_file = $smtpd_tls_dh512_param_file
tlsproxy_tls_dkey_file = $smtpd_tls_dkey_file
tlsproxy_tls_eccert_file = $smtpd_tls_eccert_file
tlsproxy_tls_eckey_file = $smtpd_tls_eckey_file
tlsproxy_tls_eecdh_grade = $smtpd_tls_eecdh_grade
tlsproxy_tls_exclude_ciphers = $smtpd_tls_exclude_ciphers
tlsproxy_tls_fingerprint_digest = $smtpd_tls_fingerprint_digest
tlsproxy_tls_key_file = $smtpd_tls_key_file
tlsproxy_tls_loglevel = $smtpd_tls_loglevel
tlsproxy_tls_mandatory_ciphers = $smtpd_tls_mandatory_ciphers
tlsproxy_tls_mandatory_exclude_ciphers = $smtpd_tls_mandatory_exclude_ciphers
tlsproxy_tls_mandatory_protocols = $smtpd_tls_mandatory_protocols
tlsproxy_tls_protocols = $smtpd_tls_protocols
tlsproxy_tls_req_ccert = $smtpd_tls_req_ccert
tlsproxy_tls_security_level = $smtpd_tls_security_level
tlsproxy_tls_session_cache_timeout = $smtpd_tls_session_cache_timeout
tlsproxy_use_tls = $smtpd_use_tls
tlsproxy_watchdog_timeout = 10s
trace_service_name = trace
transport_maps =
transport_retry_time = 60s
trigger_timeout = 10s
undisclosed_recipients_header =
unknown_address_reject_code = 450
unknown_address_tempfail_action = $reject_tempfail_action
unknown_client_reject_code = 450
unknown_helo_hostname_tempfail_action = $reject_tempfail_action
unknown_hostname_reject_code = 450
unknown_local_recipient_reject_code = 550
unknown_relay_recipient_reject_code = 550
unknown_virtual_alias_reject_code = 550
unknown_virtual_mailbox_reject_code = 550
unverified_recipient_defer_code = 450
unverified_recipient_reject_code = 450
unverified_recipient_reject_reason =
unverified_recipient_tempfail_action = $reject_tempfail_action
unverified_sender_defer_code = 450
unverified_sender_reject_code = 450
unverified_sender_reject_reason =
unverified_sender_tempfail_action = $reject_tempfail_action
verp_delimiter_filter = -=+
virtual_alias_domains = otherdomain.com
virtual_alias_expansion_limit = 1000
virtual_alias_maps = hash:/etc/postfix/virtual_maps, hash:/usr/local/mailman/data/virtual-mailman
virtual_alias_recursion_limit = 1000
virtual_delivery_slot_cost = $default_delivery_slot_cost
virtual_delivery_slot_discount = $default_delivery_slot_discount
virtual_delivery_slot_loan = $default_delivery_slot_loan
virtual_destination_concurrency_failed_cohort_limit = $default_destination_concurrency_failed_cohort_limit
virtual_destination_concurrency_limit = $default_destination_concurrency_limit
virtual_destination_concurrency_negative_feedback = $default_destination_concurrency_negative_feedback
virtual_destination_concurrency_positive_feedback = $default_destination_concurrency_positive_feedback
virtual_destination_rate_delay = $default_destination_rate_delay
virtual_destination_recipient_limit = $default_destination_recipient_limit
virtual_extra_recipient_limit = $default_extra_recipient_limit
virtual_gid_maps =
virtual_initial_destination_concurrency = $initial_destination_concurrency
virtual_mailbox_base =
virtual_mailbox_domains = $virtual_mailbox_maps
virtual_mailbox_limit = 51200000
virtual_mailbox_lock = fcntl, dotlock
virtual_mailbox_maps =
virtual_minimum_delivery_slots = $default_minimum_delivery_slots
virtual_minimum_uid = 100
virtual_recipient_limit = $default_recipient_limit
virtual_recipient_refill_delay = $default_recipient_refill_delay
virtual_recipient_refill_limit = $default_recipient_refill_limit
virtual_transport = virtual
virtual_uid_maps =


Code:

# cat /etc/postfix/master.cf
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
smtp      inet  n       -       n       -       -       smtpd
#smtp      inet  n       -       n       -       1       postscreen
#smtpd     pass  -       -       n       -       -       smtpd
#dnsblog   unix  -       -       n       -       0       dnsblog
#tlsproxy  unix  -       -       n       -       0       tlsproxy
submission inet n       -       n       -       -       smtpd
#  -o syslog_name=postfix/submission
#  -o smtpd_tls_security_level=encrypt
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#smtps     inet  n       -       n       -       -       smtpd
#  -o syslog_name=postfix/smtps
#  -o smtpd_tls_wrappermode=yes
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#628       inet  n       -       n       -       -       qmqpd
pickup    unix  n       -       n       60      1       pickup
cleanup   unix  n       -       n       -       0       cleanup
qmgr      unix  n       -       n       300     1       qmgr
#qmgr     unix  n       -       n       300     1       oqmgr
tlsmgr    unix  -       -       n       1000?   1       tlsmgr
rewrite   unix  -       -       n       -       -       trivial-rewrite
bounce    unix  -       -       n       -       0       bounce
defer     unix  -       -       n       -       0       bounce
trace     unix  -       -       n       -       0       bounce
verify    unix  -       -       n       -       1       verify
flush     unix  n       -       n       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       n       -       -       smtp
relay     unix  -       -       n       -       -       smtp
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       n       -       -       showq
error     unix  -       -       n       -       -       error
retry     unix  -       -       n       -       -       error
discard   unix  -       -       n       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       n       -       -       lmtp
anvil     unix  -       -       n       -       1       anvil
scache    unix  -       -       n       -       1       scache
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