Postfix not receiving mail

craftyc · Guru Joined: 23 May 2002 Posts: 443 Location: Behind You.

When I send mail to username@subdomain.mydomain.com via the email address my ISP gave me, it never gets delivered. I have gone through the Desktop Configuration guide to the word, have searched around but still no joy.

Could somebody please help me sort out this problem. Thank you.
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delta407 · Posted: Tue Jul 16, 2002 3:06 pm Post subject:

1. Is postfix running?
2. Can you connect to postfix? (telnet my.static.ip.address 25)
3. Is postfix set up as an MX for your target domain? (nslookup/dig your domain)
4. ...

More information, please.
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craftyc · Guru Joined: 23 May 2002 Posts: 443 Location: Behind You.

abhishek · Posted: Tue Jul 16, 2002 4:07 pm Post subject:

delta407 · Posted: Tue Jul 16, 2002 4:09 pm Post subject:

First you have to make sure that your SMTP port is connectable from the outside. Then, you have to set up your DNS records for the target domain to forward mail to your server.

Basically, when a mail server receives mail for mydomain.com, it asks it's local friendly DNS server for routing information. This is stored in MX (Mail eXchange) records, which determine what mail server should accept mail for mydomain.com. You can get nslookup and/or dig by running "emerge bind-tools", and you can look up your MX records as follows:

craftyc · Guru Joined: 23 May 2002 Posts: 443 Location: Behind You.

I should also have mentioned that if I send an email to username@my.fully.qualified.domain.name from root@my.fully.qualified.domain.name, I receive the e-mail.

Here is the output of dig.

delta407 · Posted: Tue Jul 16, 2002 6:25 pm Post subject:

craftyc · Guru Joined: 23 May 2002 Posts: 443 Location: Behind You.

delta407 · Posted: Tue Jul 16, 2002 6:43 pm Post subject:

aardvark · Guru Joined: 30 Jun 2002 Posts: 576

But if your isp does not forward port 25 as in my case (spam reduction) , what do you do then? Ask them to make an mx record for your mailserver?

In my case, which look equal the the one of the topicstarter, it is impossible to get mail delivered to my server from outside the domain of the isp... or at least I think so. DO I understand correctly that the ISP has to make an mx record on their dns?

delta407 · Posted: Tue Jul 16, 2002 10:00 pm Post subject:

MoonWalker · Guru Joined: 04 Jul 2002 Posts: 510

Hi!

Can I jump in here and take part of your expertice delta? I'm setting up postfix as well right and have a slightly different problem and have searched postfix mail achive for hours without finding a solution. I have it up working ok except for one detail. I have several domains setup using virtual_maps as an example:

posthost.biz virtual
joakim@posthost.biz joakim
kamila@posthost.biz kamila

$myhostname = ns1.astrocalc.net
$mydomain = astrocalc.net

.... etc.

Problem is when I from a webmail account send a mail to kamila@posthost.biz

it shows up in mail log as kamila@astrocalc.net and joakim@posthost.biz even comes through prepended with an other of my local usernames netjosch@astrocalc.net

I wonder if this possibly can have to do the way I have set up MX for the virtual or alias domains? Here's a dig...

delta407 · Posted: Wed Jul 17, 2002 3:48 am Post subject:

It sounds like Postfix is receiving the mail, so your MX configuration is fine. AFAIK no MTA gets confused if the return on an MX record is not the same as theh hostname the remote MTA gives out. So, as long as that MX in turn resolves to your IP, you should be good.
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