Hello,

I'm operating a bug tracker which sends out emails to participants notifying of ticket changes. For new submitters it often happened, that they simply did reply by mail which wont work with this instance.

Now I changed our setup a bit

In postfix main.cf:
smtpd_recipient_restrictions = ...check_recipient_access 
hash:/etc/postfix/recipient_access...

and
recipient_access:
t...@mail.tld reject This trac does not have an e-mail input functionality.

This works like a charm, but then today something new did pop up. Sender verify. It seems there are mail servers outside which connect back to the original server and check for errors:

    550-Verification failed for <t...@email.tld> 550-Previous
    (cached) callout verification failure 550 Sender verify failed (in reply to
    RCPT TO command)

This prevents to notify them completely, as their servers wont accept any mail from the ticket system. Turning off that feature I'd need to manually inform mail senders again which I want to prevent.

Is there any solution to satisfy the "no-reply" mail address feature and these sender verifiers. They don't actually send a mail, so maybe my reject can come a bit later in the mail receiving process?

Ciao
--
http://www.dstoecker.eu/ (PGP key available)

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