Am 24.05.20 um 17:19 schrieb @lbutlr:
On 23 May 2020, at 08:52, Thomas <postfixli...@mytelpbx.com> wrote:
or <nor...@mydomain.tld>

The norm is to use an address along the lines you describe there. I use 
no-reply@<domain>. Emails to that address are accepted and discarded. Do not 
use a fake domain or someone else's domain, of course. You can certainly have the 
address be invalid so it generates a rejection, but which you chose is really just up 
to you.

OK, I use now unkńown user NOREPLY
NOREPLY <nore...@mydomain.com>
Domain must be valid, otherwise lots of Email server will not accept:

Sender address rejected: Domain not found (in reply to RCPT TO command))

Same as my server:)

smtpd_recipient_restrictions =
reject_unknown_sender_domain,
reject_unknown_recipient_domain,

thanks
Thomas

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