How to enable debug mode of postfix

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5

Issue

How to enable debug mode of postfix

Resolution

  • You can do it as following approach
  1. to debug connection from specific host, you can configure it on main.cf file with debug_peer_level and debug_peer_list:
    For example
     debug_peer_level = 10

     debug_peer_list = 127.0.0.1
     debug_peer_list = example.domain
  1. if you need some procedure in each components of postfix (smtpd, cleanup,smtp and so on...), you can add -v on /etc/postfix/master.cf file.

For example:

smtp      inet  n       -       n       -       -       smtpd -v
(snip)
cleanup   unix  n       -       n       -       0       cleanup -v
(snip)
smtp      unix  -       -       n       -       -       smtp -v

** add -v at the end of each lines as option

Then restart postfix service , In above example, smtpd , cleanup , and smtp process will be started in verbose mode.
By this configuration, each component print many informations in /var/log/maillog.

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