FWIW, it looks like most of these issues are because of spam filters and or rejecting mail from servers with no rDNS (reverse DNS records). Also I would recommend hardware default on the nic.
I've never really liked the cryptic 'catch all' MX connect fail log entries either. Should state why - if known.
Imail logging is weak in the area of smptd/smtp behavior.
While IMGate is chosen primarily because it offloads so much work from Imail, a huge secondary advantage of letting IMGate, rather than Imail, send/receive with Internet is the detailed postfix logging, without which Imail's troubleshooting is groping in the dark, as in this common case.
Len
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