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> What are the DNS records (MX, A) for your mail server?
> mail.kasdivi.com. IN A 220.127.116.11
> kasdivi.com. IN MX 5 mail.kasdivi.com.
> Now, look in your logs for 18.104.22.168. If nothing is there,
> then your logging is broken
> My Log shows
> pr 16 15:33:07 tuna postfix/smtpd: permit_mynetworks:
> spike.porcupine.org 22.214.171.124
If you don't see Mindspring etc. activity in your logs, then
- Their servers are not connecting to your machine, for reasons
that have yet to be determined (no glue records for kasdivi.com
at the top-level DNS servers, sender does not like your generic
reverse DNS record, ...).
- Their servers do connect, but their activity is lost in all your
I would start with turning off Postfix verbose logging, then monitor
the logfile for sessions that fail repeatedly with "lost connection",
"timeout" and other abnormalities.