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:	mailman subdomain not recognized by some mail servers
Group:	Postfix-users
From:	Zbigniew Szalbot
Date:	29 Mar 2008

Hello,

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]

wp.pl:
Mar 29 08:46:41 szalbot postfix/smtpd[76022]: NOQUEUE: reject: RCPT
from mx1.wp.pl[212.77.101.5]: 550 5.1.1 <testful>:
Recipient address rejected: User unknown in virtual mailbox table;
from=<z.szalbot> to=<testful> proto=ESMTP
helo=<mx1.wp.pl> Mar 29 08:46:41 szalbot postfix/smtpd[76022]:
disconnect from mx1.wp.pl[212.77.1

Same with Yahoo. But Gmail is fine:

Mar 29 09:23:40 szalbot postfix/cleanup[77179]: 206BB28446:
message-id=<94136a2c0803290223l3f53ef65u4d5ea250c06daa3f>
Mar 29 09:23:40 szalbot postfix/qmgr[38553]: 206BB28446:
from=<zszalbot>, size=2240, nrcpt=1 (queue active)
Mar 29 09:23:40 szalbot postfix/smtp[77180]: 8044228444:
to=<testful>,
relay=127.0.0.1[127.0.0.1]:10024, delay=1.1,
delays=0.56/0.03/0.01/0.45, dsn=2.6.0, status=sent (250 2.6.0 Ok,
id=75252-10, from MTA: 250 2.0.0 Ok: queued as 206BB28446)

I made SURE I was sending it to testful
but for some unknown reason some providers addressed it to
testful.

What can be a reason for such a behaviour? This is a test machine but
I would like to implement mailman subdomain on a production machine.
Can you help me troubleshoot the problem? It does not seem related to
postfix rather to DNS issues. I have setup szalbot.homedns.org for
test purposes and have reserved mailman.szalbot.homedns.org for
mailman mailing lists.

Many thanks for your advice!

--
Zbigniew Szalbot