Ralph Angenendt wrote on Wed, 17 Jun 2009 13:15:20 +0200:
There is a user "centos" on that machine, but as aliases >> local users in postfix context, I'm really out of ideas.
I think there must be some forwards that temporarily do not work or create a loop condition. Btw, it's happening only since a year or so. Or it's a misconfigured Exchange system that passes the mail thru again to centos@centos.org which then gets detected.
Kai