Hello,
we have mailboxes, for which mail is being forwarded to external addresses via contacts. The forward works as it should. But I discovered in the smtpsend log, that the MAIL FROM is changed from the orignal sender to the emailaddress of the mailbox. So when the mail can not be delivered to the external address, e.g. mailbox full or user deleted, the NDR does not go to the orginal sender, but to the mailbox, which is forwarded to the address, that generated the non delivery report! That's a great loop and no one ever knows that the message can not be delivered. What can I do, to change the behaviour, so that the MAIL FROM retains the orignal senderaddress?
The same is also true for mails to a distribution list with external members. The NDR goes to the group, not the original sender.
Thanks