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. But the MX record for tls-mail.com points to mail.tls-mail.com. mail.tls-mail.com resolves to 20.120.225.36. 20.120.225.36 reverses to tls-mail.westus2.cloudapp.azure.com. I'd very much like to learn why it's wrong for me, but right for you.
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