I would like to reject mails to a certain address with a custom message. Mails to other non existing addresses should be unchanged. How can I do that? I'm using Postfix 2.7.0 on Ubuntu 10.4.

Background: My websites sends mails to my users, and so far, my personal address is used as the sender. I would like to change this to a noreply@... address, but since the users reply quite often to these emails, I would like to send them a helpful reject message.


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  • So, basically you want to reply with a helpful reject message on messages sent to a noreply address :) – ΤΖΩΤΖΙΟΥ May 8 '11 at 15:54
  • I recommend using a customer service email address if possible, rather than a noreply@ email address. That way the users can reply and get a response. :) – Collin Anderson Sep 9 '16 at 19:51

Create a custom_replies map (i.e. /etc/postfix/custom_replies) with the following contents:

noreply@mydomain.com REJECT Like I said, NOREPLY

Run sudo postmap /etc/postfix/custom_replies.

Edit /etc/postfix/main.cf and put the following as the first check of the smtpd_recipient_restrictions:

check_recipient_access hash:/etc/postfix/custom_replies,

Then issue a sudo postfix reload.

Try sending email to noreply@mydomain.com:

$ telnet localhost 25
Trying ::1...
Connected to localhost.
Escape character is '^]'.
220 mydomain.com ESMTP Postfix (Ubuntu)
HELO localhost
250 mydomain.com
MAIL FROM: <god@mydomain.com>
250 2.1.0 Ok
RCPT TO: <noreply@mydomain.com>
554 5.7.1 <noreply@mydomain.com>: Recipient address rejected: Like I said, NOREPLY
221 2.0.0 Bye
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  • Obviously I ran the telnet session on the mail server itself. – ΤΖΩΤΖΙΟΥ May 8 '11 at 16:37
  • I recommend using PCRE (and not HASH) so you do need to run "postmap" every time the file is modified. It's just one less hassle. – Brian Smith Jun 2 '17 at 3:30

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