>>>>> "Wietse" == Wietse Venema <wie...@porcupine.org> writes:
Wietse> Postfix reports this error because it is responsible for 'example.com' Wietse> and the message has 'Delivered-To: u...@example.com'. Thank you for your reply! And thank you for postfix in general, it's made my life simpler in so many ways. Wietse> There are several options: Wietse> 1) Your error. Your system is sending mail out after adding the Wietse> 'Delivered-To: u...@example.com' header, and it comes back from Wietse> outlook.com. If Postfix did not block such email then it could loop Wietse> forever. In this case no, the email is all coming from external people and getting blocked by the spam filtering system. When the user goes to release it, then it gets looped back. Wietse> 2) User error. After your system adds the 'Delivered-To: u...@example.com' Wietse> header, some of your users forward their email off-site. That email Wietse> ends up at a system that looks at the message header address and Wietse> that forwards that email to outlook.com. This results in a similar Wietse> problem as (1). If Postfix did not block such email then it could Wietse> loop forever. This is something to check, but I'm not sure. Wietse> 2) Outlook error. Outlook.com adds the 'Delivered-To: u...@example.com' Wietse> header. In that case all mail from Outlook.com would have this Wietse> problem. It does not seem likely. Wietse> My money is on (1) or (2). Is there any way I can keep a copy of these emails for debugging, even though I still bounce them back? I'd like to confirm what the headers are if at all possible. John
