I've setup a simple rule on one of our mailboxes which replies to every email it receives using the "have server reply using x" rule.
This is just to send a confirmation of receipt email to anyone who sends something in.
The rule also ignores our internal domains (using "except with x in the senders address) and I can see it working fine until it actually hit's the Exchange back-end. If I review the Message Tracking Log I can see that any "AutoReplies" are being dropped with the following message:
250 2.1.5 RESOLVER.MSGTYPE.AR; handled AutoReply addressed to external recipient
The SourceContext also shows:
I can't find much with regards to turning this off, can anyone shed any light?
Note that if I remove the "except with x in the senders address" it does in fact deliver the auto response to an internal mailbox without issue. This only seems to affect external email