On Thu, Jun 13, 2024 at 08:51:38AM +0800, Jeff Peng via Postfix-users wrote:
> 8. have reject_unknown_client_hostname, reject_unknown_sender_domain options
> for smtpd_sender_restrictions.
You may find "reject_unknown_client_hostname" to be too "aggressive", in
which case "reject_unknown_reverse_client_hostname" is generally safer.
--
Viktor.
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