Re: mailman subdomain not recognized by some mail servers

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mailman subdomain not recognized by some mail s...
\ Zbigniew Szalbot (29 Mar 2008)
. \ Magnus Bäck (29 Mar 2008)

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Subject:	Re: mailman subdomain not recognized by some mail servers
Group:	Postfix-users
From:	Magnus Bäck
Date:	29 Mar 2008

On Saturday, March 29, 2008 at 10:40 CET,
Zbigniew Szalbot <zszalbot> wrote:

> I have set up a mailman list called
> testful with postfix as the MTA. I tried
> emailing test messages to it from Hotmail, Gmail and some other
> accounts. All well. But then I tried from my test aim.com and
> wp.pl/onet.pl (local Polish provider) accounts. And see what happens:
>
> aim.com: Mar 29 08:43:53 szalbot postfix/smtpd[75797]: NOQUEUE:
> reject: RCPT from imo-m19.mx.aol.com[64.12.137.11]: 550 5.1.1
> <testful>: Recipient address rejected: User
> unknown in virtual mailbox table; from=<zbyszekszalbot>
> to=<testful> proto=ESMTP helo=<imo-m19.mx.aol.com>
> Mar 29 08:43:53 szalbot postfix/smtpd[75797]: disconnect from
> imo-m19.mx.aol.com[64.12.137.11]

mailman.szalbot.homedns.org is a CNAME record pointing to
szalbot.homedns.org. Some MTAs rewrite CNAME domains to the
corresponding A record name and some don't.

Don't use CNAME records for email.

[...]

--
Magnus Bäck
magnus