On Sun, Apr 30, 2023 at 01:33:13AM +0100, Allen Coates via Postfix-users wrote:
> Any ideas on the opposite - i.e. WITHOUT a domain?
>
> I sometimes receive messages from "u...@co.uk"...
With eTLD (effective TLD) domains that have neither address nor MX
records the
reject_unknown_sender_domain
restriction will refuse mail with an *envelope* sender in such a domain.
However, there is no built-in feature in postfix to apply similar rules
to message headers.
--
Viktor.
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