Thanks for taking the time to get back to em Uwe ... much appreciated.
The mail is being sent to a "governing" gov. organization and then gets pushed on from there. They're rejecting it because its' not resolving to the sender I mentioned in the original post, Mailbox@DomainName.
I don't understand why the upgraded GWIA is adding the PostOffice name in front of Mailbox@DomainName ?
so it isn't only in the logs, also the mail addresses in the mails get changed? Double check your internet addressing settings, maybe the upgrade has changed stuff there. One indicator may be a changed mail address property on the eddir user object. If that's the case, repair the internet addressing and synchronize all users.
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