Postfix disable error email notifications

postfix

I'm trying to disable Postfix error email notifications. I do not want to receive notification emails whenever a "User is unknown in virtual mailbox table".

I still want to receive bounce notifications.

main.cf :

notify_classes = bounce
bounce_notice_recipient = bounce@example.com

After restarting Postfix, I'm still receiving these emails
(sent to postmaster – not bounce).

Any ideas how to fix this? I'm receiving a lot of notification emails from spammers sending emails to non-existent addresses.

Postfix SMTP server: errors from example.com[​11.22.33.44]

Transcript of session follows.

Out: 220 example.com ESMTP Postfix (3.2.0)
In:  EHLO whatever.com
Out: 250-example.com
Out: 250-PIPELINING
Out: 250-SIZE 50000000
Out: 250-ETRN
Out: 250-STARTTLS
Out: 250-ENHANCEDSTATUSCODES
Out: 250-8BITMIME
Out: 250-DSN
Out: 250 SMTPUTF8
In:  STARTTLS
Out: 220 2.0.0 Ready to start TLS
In:  EHLO whatever.com
Out: 250-example.com
Out: 250-PIPELINING
Out: 250-SIZE 50000000
Out: 250-ETRN
Out: 250-AUTH PLAIN DIGEST-MD5 LOGIN
Out: 250-AUTH=PLAIN DIGEST-MD5 LOGIN
Out: 250-ENHANCEDSTATUSCODES
Out: 250-8BITMIME
Out: 250-DSN
Out: 250 SMTPUTF8
In:  MAIL FROM:<spammer@spam.com> SIZE=2110
Out: 250 2.1.0 Ok
In:  RCPT TO:<asdfasdf@example.com>
Out: 550 5.1.1 <asdfasdf@example.com>: Recipient address rejected: User
  unknown in virtual mailbox table
In:  RSET
Out: 250 2.0.0 Ok
In:  QUIT
Out: 221 2.0.0 Bye

Best Answer

I solved the issue by adding this line to main.cf :

error_notice_recipient = blackhole@localhost

error_notice_recipient (default: postmaster)

The recipient of postmaster notifications about mail delivery problems that are caused by policy, resource, software or protocol errors. These notifications are enabled with the notify_classes parameter.

Then adding this line to /etc/aliases :

blackhole: /dev/null

Do not use this solution if your "notify_classes" line contains either policy, resource, software or protocol.

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