The customer wrote a not so friendly email claiming that they rcx average 400-500 email daily without problems except from ours. i.e 7.14. Now, that is dissappointing.
As a follow-up on this, I've received some more information from people who were experiencing this problem.
It seems that the problem is occurring when either the remote mailserver returns a 421 response (which indicates that IMail should try that server again), or where the remote mailserver responds to the TCP/IP connection by immediately disconnecting (as it would if there was no SMTP server listening on port 25). In the first case, IMail is acting correctly. In the second case, it is unclear how the mailserver should respond (the MX record points to a computer that is reachable, but doesn't have SMTP running on it -- most likely, the server is in the process of rebooting). If anyone knows of an RFC that specifies how this situation should be handled, I would be very interested.
-Scott
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