I posted this question before to m.p.e.connectivity and got no replies
(presumably not enough info) but we run Exchange Server 4.0 and have recently
had to reinstall after a major hard-disk failure.
The problem now is that although everything appears to work, half of our
outgoing emails are not being sent. The user simply gets a 'Non delivery
report' message with no other info. I have checked the logs and they report
that the server can't find a MSMail user for delivery even though the address
is clearly an Internet address.
Doe anyone have any ideas as to what would cause this?