On Tue, Apr 18, 2023 at 10:35:22AM +0800, tom--- via Postfix-users wrote:
> So my question is, smtp code 450 will cause the sender to retry delivery
> to secondary MX?
Yes, if the client is a legitimate MTA, less common with a junk-sending
botnet. Once you're confident your restriction settings are sound:
plaintext_reject_code = 550
unknown_address_reject_code = 550
unknown_client_reject_code = 550
unknown_hostname_reject_code = 550
unverified_recipient_reject_code = 550
unverified_sender_reject_code = 550
but you should rush to do this without watching your logs for some time
and fully understanding the rules you've configured.
--
Viktor.
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