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451 server configuration error when receiving incoming e-mails from mail.gmx.de only on Postfix 1.1.11

From: Carsten Kuckuk (ckkuckuk.com)
Date: Tue Dec 07 2004 - 10:28:13 CST

Dear List members,

I've run my Linux server with Postfix as MTA on it for well over a year
in the same configuration (only changes to an ip whitelist so that
important mail doesn't get blocked by RBLs) without any real problems. A
few weeks ago I started noticing problems receiving e-mail from GMX.
Here's what I see in my logs:

>>>>>
Dec 7 17:03:34 p15120109 postfix/smtpd[23922]: connect from
mail.gmx.de[213.165.64.20]
Dec 7 17:03:34 p15120109 postfix/smtpd[23922]: 87F5734C03B:
client=mail.gmx.de[213.165.64.20]
Dec 7 17:03:34 p15120109 postfix/smtpd[23922]: warning: unknown smtpd
restriction: "OK"
Dec 7 17:03:34 p15120109 postfix/smtpd[23922]: reject: RCPT from
mail.gmx.de[213.165.64.20]: 451 Server configuration error;
from=<Sun-Bygmx.de> to=<ckkuckuk.com>
Dec 7 17:03:34 p15120109 postfix/smtpd[23909]: D5EF334C03C:
client=unknown[200.111.27.90]
Dec 7 17:03:40 p15120109 postfix/cleanup[23980]: 5655F34C03D:
message-id=<20041207160339.5655F34C03Dp15120109.pureserver.info>
Dec 7 17:03:40 p15120109 postfix/smtpd[23922]: disconnect from
mail.gmx.de[213.165.64.20]
Dec 7 17:03:40 p15120109 postfix/qmgr[14029]: 5655F34C03D:
from=<double-bouncep15120109.pureserver.info>, size=699, nrcpt=1 (queue
active)
Dec 7 17:03:41 p15120109 postfix/local[23981]: 5655F34C03D:
to=<ckcarstenkuckuk.de>, relay=local, delay=2, status=sent (mailbox)
<<<<<

and the double bounce e-mail reads as follows:

>>>>>
Transcript of session follows.

  Out: 220 p15120109.pureserver.info ESMTP Postfix
  In: HELO mail.gmx.net
  Out: 250 p15120109.pureserver.info
  In: MAIL FROM:<Sun-Bygmx.de>
  Out: 250 Ok
  In: RCPT TO:<ckkuckuk.com>
  Out: 451 Server configuration error
  In: QUIT
  Out: 221 Bye
<<<<<

I usually get between 50 and 100 e-mails per day, and it is only mail
from GMX that I run into problems with. Generally GMX tries it again a
few minutes later, and then everything goes well.

Does anybody of you have any idea of what might be going wrong here?

p15120109:/etc/postfix # postconf | grep "version"
mail_version = 1.1.11

Carsten