Monday, March 18, 2024, 1:52:46 PM, Glenn Tenney via Postfix-users  wrote:

> My question in one, hopefully simple sentence, is:

> In Postfix, how do I configure Postfix such that all email to
> "user@some.domain" will return an error code (e.g. 550 user unknown)
> to bounce that email????


> Glenn
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> Postfix-users mailing list -- postfix-users@postfix.org
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Not sure about the rest of your requirements but perhaps

smtpd_recipient_restrictions = reject_unverified_recipient

https://www.postfix.org/ADDRESS_VERIFICATION_README.html


-- 
Cheers,
Phil

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