Hello Wietse,
I have added this line:
smtpd_reject_unlisted_sender = yes
into main.cf.
May I ask, this option is for submission request, or for MX request?
Thanks.
On 2024-06-14 04:14, Wietse Venema via Postfix-users wrote:
Wietse Venema via Postfix-users:
A paranoid configuration could add:
smtpd_reject_unlisted_sender = yes
That is, do not send mail with a sender address that is known to
be invalid (the SMTP server would reject mail for the address with
"user unknown").
For more details (what is valid, why reject invalid senders) see
https://www.postfix.org/postconf.5.html#smtpd_reject_unlisted_sender
This will respect address extensions, because it reuses the logic for
rejecting unknown recipients. Less code, more functionality.
Wietse
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