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It sounds like maybe your mail server had a misconfigured reverse DNS entry? Those DNS PTR records look like ZZ.YY.XX.WW.in-addr.arpa. I'm aware that SMTP in pa
by maccam94 6y ago
It sounds like maybe your mail server had a misconfigured reverse DNS entry? Those DNS PTR records look like ZZ.YY.XX.WW.in-addr.arpa. I'm aware that SMTP in particular has a dependency on rDNS, but I'm not sure about the details.
https://en.wikipedia.org/wiki/Reverse_DNS_lookup#Uses https://en.wikipedia.org/wiki/Reverse_DNS_lookup#Uses