I've noticed that there are some outgoing e-mail messages bound for
recipients at certain e-mail addresses (most noticably addresses at MSN)
that seem to sit in the outbound queue of the IMS for extended periods
of time before being delivered. They show a condition of [host unreachable]
while they are in the queue. However, I can ping and do nslookups on the
sites and get responses. The messages almost always eventually get
delivered, but it may take hours. The remaining (and vast majority) of our
e-mails go through fine.
In one instance I can telnet via port 25 to the external exchange server and
generate an e-mail
that they will receive. If I do the same thing via our exchange server, the
message to them remains
stuck in the queue. Another oddity: if I send a message to
[EMAIL PROTECTED] (instead of [EMAIL PROTECTED])
my exchange server sends it on immediately. Of course their server spits it
back saying there's no such addressee.
We're runnign Exchange 5.5 SP3 on NT4SP6.
I would appreciate any insights or hints as to what to look for.
Thanks.
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