On Wed, Sep 04, 2024 at 06:45:03PM -0400, Wietse Venema via Postfix-users wrote:
> > why set smtpd_reject_unlisted_recipient=no here?
>
> Because this is an MUA service. Unlike an MTA, an MUA usually cannot
> send non-delivery notifications.
Not only that but the "user-experience" when submission is rejected if
often poor. The MUA throws up some obscure message, and the user
is none the wiser.
https://desertdemocrat.wordpress.com/2015/03/25/blah-blah-blah-blah-ginger/
--
Viktor.
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