I thought I could just shut down the mail server, transfer it and then swap the IP address in the DNS before bringing it back on line.
that IS the best approach, Just Do It.
On the forwarding side of things, if I do the above and then reconfigure the old server with an inbound rule to forward all messages to the IP address of the new server, shouldn't that take care of any straggler messages that are being redirected by old DNS entries?
Set your mail-related records to TTL of 1 hr or less. The switchover will be transparent for your users. Then put your TTL's up to something more reasonable, like 1 or 2 days.
For those organizations which extend _YOUR_ TTL values to be cached in their local DNSs, those organizations are responsible for not being able to deliver mail to your on-line server because their cached records are stale for excessively long times, NOT you.
Len
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