On Wed, 21 Aug 2019 08:19:24 +0200 Martijn van Duren
<opensm...@list.imperialat.at> wrote:

> From smtpd.conf(5):
> 
>              auth-optional [<authtable>]
>                      Support SMTPAUTH optionally: clients need not
>                      authenticate, but may do so.  This allows a listen on
>                      directive to both accept incoming mail from untrusted
>                      senders and permit outgoing mail from authenticated users
>                      (using match auth).  It can be used in situations where
>                      it is not possible to listen on a separate port (usually
>                      the submission port, 587) for users to authenticate.

Sounds good, but unauthenticated relaying still works with this...
-- 
Selmeci Tamás
http://www.486.hu/

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