I can't telnet to port 25 on one of their servers, but I can on the other two.
They have 3 mail servers listed in the MX record.
2 with a preference of 5 and one with a preference of 15.
Is there any way I can "force" Imail to use a particular mail server for this domain ?
In this case, you can add a line such as "192.0.2.25 example.com" to your HOSTS file (usually found at \winnt\system32\drivers\etc\hosts). IMail then will send to 192.0.2.25 for any E-mail that is sent to @example.com.
Would clearing - or turning off the DNS cache on the Queue Manager tab possibly help ??
It might. But, the same problem could occur again. It sounds like when the DNS cache is cleared (hopefully based on the TTL of the MX record), IMail has a 50% chance of reaching that bad IP. When that happens, it will be stuck, since it sounds like they are answering but immediately disconnecting (which isn't RFC-compliant, so IMail assumes the mailserver is running but something unusual happened, and tries the same server again).
-Scott
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