is anyone familiar with Outlook?
I have a weird problem. Every email message has a header, and if that header is invalid the message has a 90% chance of not being delivered.
What is invalid is the Message-ID. In my case it looks like
and that is definitely not the way it should be.
Notice the !&! in front. Could that be a redirect to an unknown receiver?
Of course, the message-ID does not start out that way but is being modified along the send route. Does anybody know where that could happen?