* Thomas:

> Wie soll ich dann als Absenderadresse zum Ausdruck bringen das ich
> keine Email rply wünsche.

One of the simplest solution is sending mail with

  From: Thomas Mustermann <nore...@domain.tld>

with the address nore...@domain.tld being *unknown* on your MX. That
should result in a generic 5xx rejection. If you want more control over
the rejection message, you can use something like the following:

  # /etc/postfix/main.cf
  smtpd_recipient_restrictions =
    ...
    check_recipient_access pcre:/etc/postfix/recipient_access
    ...

  # /etc/postfix/recipient_access
  /^noreply\@domain\.tld$/ REJECT No replies please

You can of course use a Hash type map instead of PCRE, this is just an
example.

-Ralph

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