Ahhh. besser. :)
Reporting-MTA: dns; portal.intern.de
Arrival-Date: Mon, 5 Nov 2007 16:23:04 +0100 (CET)
Final-Recipient: rfc822; info@empfaenger.de
Action: failed
Status: 4.0.0
Diagnostic-Code: X-Postfix; connect to mailin.rzone.de[81.169.145.102]:
Connection refused
4.0.0 - das bedeutet:
4.X.X Persistent Transient Failure
A persistent transient failure is one in which the message as
sent is valid, but some temporary event prevents the successful
sending of the message. Sending in the future may be successful.
IMHO hats da auf der Empfängerseite was mit dem einen User-Account. Die Fehlermeldung selbst spricht ja auch eine deutliche Sprache:
This is the Postfix program at host portal2.XX.de.
I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.
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 message returned below.
The Postfix program
<info@beXXXXXXg.de>: connect to mailin.rzone.de[81.169.145.102]: Connection
refused