Hi

I have made a spamfilter server based on Postfix and MailScanner. I
wan't postfix to reject emails to email-addresses that does not exist
on our exchange server. I use a nice perl script that collects the
email-addresses from Exchange AD with LDAP.

main.cf:
------------------------------
transport_maps = hash:/etc/postfix/transport
relay_domains = example.com

smtpd_recipient_restrictions = check_recipient_access
hash:/etc/postfix/recipient_access
                                                 reject
-------------------------------

Everything works fine and mails are rejected as they are supposed to with:

554 554 5.7.1 <no.such.u...@example.com>: Recipient address rejected:
Access denied (state 14).

My question is - Can I also send a reason about why the email was
rejected. Something like 'User does not exist'?

-- 
Best regards
Martin Schiøtz

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