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dovecot + vpopmail (migration from courier-authlib)
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Joined: 08 Feb 2005
Posts: 26
Location: Czech Republic

PostPosted: Sat Sep 06, 2008 5:18 pm    Post subject: dovecot + vpopmail (migration from courier-authlib) Reply with quote

Because the courier-authlib > 0.60.3 does not contain authentication method for vpopmail (authvchkpw) and because all courier-authlib < 0.60.6 are vulnerable ( I decidet to move to dovecot. Here is the description how to do that for IMAPS without MySQL support:

Add vpopmail USE flag:
echo "net-mail/dovecot vpopmail -mysql" > /etc/portage/package.use

Install dovecot:
emerge -av dovecot

Edit your config file /etc/dovecot/dovecot.conf:
grep -vE "(#|^$)" /etc/dovecot/dovecot.conf
protocols = imaps
listen = [::]
disable_plaintext_auth = no
ssl_cert_file = /etc/ssl/dovecot/server.pem
ssl_key_file = /etc/ssl/dovecot/server.key
mail_location = maildir:/var/vpopmail/domains/%d/%n/.maildir
first_valid_uid = 89
protocol imap {

auth_verbose = yes
auth_debug = yes
auth default {
  mechanisms = plain
  passdb vpopmail {
  userdb vpopmail {

You can check your current configuration:
dovecot -n
# 1.1.1: /etc/dovecot/dovecot.conf
protocols: imaps
listen: [::]
ssl_cert_file: /etc/ssl/dovecot/server.pem
ssl_key_file: /etc/ssl/dovecot/server.key
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable: /usr/libexec/dovecot/imap-login
first_valid_uid: 89
mail_location: maildir:/var/vpopmail/domains/%d/%n/.maildir
auth default:
  verbose: yes
  debug: yes
    driver: vpopmail
    driver: vpopmail

If you have a problem with certificates generate new (for 10 years):
cd /etc/ssl/dovecot
openssl req -new -days 3650 -x509 -nodes -out server.pem -keyout server.key

If you want to debug any other problems, you can use these options in the config file:
verbose_ssl = yes
mail_debug = yes
auth_verbose = yes
auth_debug = yes

Last edited by jiri.tyr on Mon Oct 13, 2008 2:46 pm; edited 1 time in total
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Joined: 10 Mar 2007
Posts: 5
Location: Sweden

PostPosted: Mon Sep 08, 2008 10:41 am    Post subject: Reply with quote

I thought I would share my first experience with migrating to dovecot from courier-imap. First problem was that no user added folders was showing up in imap list. Found this useful site that helped

Basically what helped was adding this in dovecot.conf

namespace private {
prefix = INBOX.
inbox = yes

Second really annoying problem was that dovecot simply died randomly with the error message: "Time moved backwards, I'm going to kill myself" Apparently running NTPD on the host most of the time fixes this problem. But it didn't work for us because we running an virtual server in VMWARE ESX cluster and the system clock is trying to sync with the ESX host. The ESX host has NTPD running an clocks are synced.
Most likely the problem we are experiencing is described here:

So what we ended up doing for a quickfix was patching /src/lib/ioloop.c with the changes posted here:

*** EDIT ***
Solution to this problem if you are running in an VMware ESX enviroment is to add "notsc" to the kernel line in menu.lst
That resolves this issue for dovecot.
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