A few comments below on selected lines: On Mon, 3 Dec 2012, Karsten Becker wrote:
Dec 3 09:52:39 mail01 postfix/pipe[15199]: B0E971720080: to=<karsten-t...@lists.foo.de>, relay=mailman, delay=0.21, delays=0.05/0.01/0/0.16, dsn=2.0.0, status=sent (delivered via mailman service)
As I now see in your master.cf, you're using the postfix-to-mailman.py script. This is a third-party product and is not supported by the Mailman developers. I know nothing about postfix-to-mailman so I have no idea if that's the source of the delay.
Dec 3 09:53:02 mail01 postfix/smtpd[15221]: 0D45F172007D: client=localhost[127.0.0.1]
OK, now it's 23 seconds later but we're missing the "connect from" log line from Postfix. At this point, Postfix already has the message as evidenced by the queue-ID (0D45F172007D) in the message. So without seeing when the connect occurred, we don't know if the delay is in Mailman or Postfix.
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