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).
if the SMTP client can't open an SMTP dialog with the SMTPD server, this is "unreachable" so try backup MX. TCP connection does not count at "SMTP reachable"
Len
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