On 2024-06-19 10:11, Scott Mutter via mailop wrote:
On Tue, Jun 18, 2024 at 8:31 PM Jeff Peng via mailop
<mailop@mailop.org>
wrote:
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.
Not sure why this has shifted focus to amscomputer.com.
sorry my mistake. your IP seems right for me.
$ dig -x 107.181.229.51 +short
zephyr.wznoc.com.
$ dig zephyr.wznoc.com +short
107.181.229.51
regards.
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