On 2024-06-19 07:18, Michael Peddemors via mailop wrote:
https://wznoc.com/
With a obscure page like that, you are asking for trouble..
Just like the pages many of the bullet proof hosters throw up..
Why not use amscomputer.com in the PTR records, if these are your
servers?
https://www.amscomputer.com/
Mike is right.
mx1.amscomputer.com has an A RR 107.181.229.51 which points back its
PTR to zephyr.wznoc.com.
the two domains are not matched, hence messages sent from this server
will be rejected by postfix's such configuration:
smtpd_sender_restrictions = reject_unknown_client_hostname
I believe many postmasters (including me) are using this setup in their
postfix.
Thanks.
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