I need some help diagnosing a problem using postfix as my outbound mail server with Mailman.

Up front I want to say, I have this working FINE with my current mailman list server. I'm in the process of moving my list server to an AWS lightsail instance.

And, yes, I know that I could use postfix as both the inbound & outbound mail server ... which I probably should do, but I'm far more familiar with using sendmail and have it setup & working fine on my current list server.

I've got just about everything setup and working fine.

The problem is, I'm seeing this in my mail log...

Nov 15 15:41:43 lists postfix/smtp[18136]: AA76A61E61: to=, relay=none, delay=0.01, delays=0/0/0/0, dsn=5.4.6, status=bounced (mail for localhost loops back to myself)

It appears that postfix thinks it's the mail server for lists.atestdomain.net and can't deliver the mail because it doesn't know how to deliver the message.

Here's my current setup:

I have sendmail listening on the public SMTP ports on the server. I have postfix listening on localhost:24. Mailman is configured with the SMTPHOST & SMTPPORT set to localhost & 24.

So mail is received by sendmail, sent to & processed by Mailman, and Mailman sends the mail out by connecting to postfix on localhost:24.

The list mail is being delivered fine ... but bounces are not getting processed correctly.

I have the domain lists.atestdomain.net listed in the transport map indicating that mail for that domain should be sent to localhost:25.

You can see a relatively complete log fragment at https://code.midrange.com/e665e40f93.html

Here's (what I think are) the relevant postfix config file entries ...


myhostname = listmail.arealdomain.com
mydomain = $myhostname
myorigin = $mydomain
inet_interfaces = localhost
mydestination = $myhostname, localhost.$mydomain, localhost
transport_maps = hash:/etc/postfix/transport


lists.atestdomain.net smtp:localhost:25
listmail.arealdomain.com smtp:localhost:25


24      inet  n       -       n       -       -       smtpd

Any suggestions on what to look at?

1 Answer 1


FWIW: I bit the bullet and switched to postfix for both inbound & outbound mail.

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