Why is fetchmail not delivering mails to OSX Server accounts?

Our fetchmail is running and trying to collect the mails from our used webserver (mail.style-xp.com). Unfortunately the sender of an email gets a message back with the following lines:

This is the mail system at host server.stylexp.int.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The mail system

<Tim@localhost.style-xp.com>: local configuration error
Reporting-MTA: dns; server.stylexp.int
X-Postfix-Queue-ID: 1275A594B5
X-Postfix-Sender: rfc822; reed187@gmx.de
Arrival-Date: Mon, 18 Oct 2010 16:42:58 +0200 (CEST)

Final-Recipient: rfc822; Tim@localhost.style-xp.com
Original-Recipient: rfc822;Tim@localhost
Action: failed
Status: 5.3.5
Diagnostic-Code: x-unix; local configuration error

Von: Jonathan Reed <reed187@gmx.de>
Datum: 18. Oktober 2010 16:42:36 MESZ
An: Tim Beck <tim.beck@style-xp.com>
Betreff: Testmail

The OSX server protocol only says:
Oct 18 16:45:05 server fetchmail[7284]: Server CommonName mismatch: plesk != mail.style-xp.com
Oct 18 16:45:05 server fetchmail[7284]: Server certificate verification error: self signed certificate

This could be also a totally different problem.

It looks like there is something wrong with DNS and Server names, as there is a double name behind the email address @ sign. But I don't know where this might come from.

Help is greatly appreciated...
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nappy_dThere are a 1000 ways to skin the technology cat.Commented:
This ties in to the other topic you and I are comunicating on.  This has to do with your MX records.  
Tim_BeckAuthor Commented:
It seemed that the internal configuration of postfix or DNS did not work properly. A fresh installation and clean configuration made the system working again...

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Tim_BeckAuthor Commented:
As mentioned in the comment: reinstalling helped to get the system back to working.
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