> What's the difference between a 'rejection' > and a 'bounce'. Happy for a > pointer to RTFM or to a FAQ if it's too OT.
Reject = MTA issues a 55x SMTP response. Causes well behaved clients/servers to issue a NDA to the return path. Bounce = MTA accepts the message, but could not complete the delivery, so it bounces the message back to the return path. Normally this is due to non-existent users, or exceeding queue lifetime due to remote server being down, but can be caused by many other things. d
