"postconf" Command to Manage Postfix Configuration

Email Tutorials - Herong's Tutorial Examples

∟"postconf" Command to Manage Postfix Configuration

This section provides a tutorial example on how to 'postconf' command to manage Postfix configuration settings.

The "postconf" command provided by the Postfix package can be used to manage Postfix configuration settings.

1. Use "postconf" command to display current Postfix main.cf settings.

herong$ postconf | more

2bounce_notice_recipient = postmaster
access_map_defer_code = 450
access_map_reject_code = 554
address_verify_cache_cleanup_interval = 12h
address_verify_default_transport = $default_transport
address_verify_local_transport = $local_transport
address_verify_map = btree:$data_directory/verify_cache
address_verify_negative_cache = yes
address_verify_negative_expire_time = 3d
address_verify_negative_refresh_time = 3h
address_verify_pending_request_limit = 5000
...

2. Use "postconf -d" command to display original default Postfix main.cf settings.

herong$ postconf -d | grep size_limit
mailbox_size_limit = 51200000
message_size_limit = 10240000

herong$ postconf | grep size_limit
mailbox_size_limit = 1024000000
message_size_limit = 102400000

3. Use "postconf -e parameter=value" command to change a Postfix master.cf setting.

herong$ sudo postconf -e message_size_limit=1024000001

herong$ postconf | grep message_size_limit
message_size_limit = 1024000001

4. Use "postconf -Mf" command to display Postfix master.cf settings.

herong$ postconf -Mf | more

smtp       inet  n       -       n       -       -       smtpd
submission inet  n       -       n       -       -       smtpd
    -o syslog_name=postfix/submission
    -o smtpd_tls_security_level=may
smtps      inet  n       -       n       -       -       smtpd
    -o syslog_name=postfix/smtps
    -o smtpd_tls_wrappermode=yes
    -o smtpd_sasl_auth_enable=yes
pickup     unix  n       -       n       60      1       pickup
cleanup    unix  n       -       n       -       0       cleanup
qmgr       unix  n       -       n       300     1       qmgr
tlsmgr     unix  -       -       n       1000?   1       tlsmgr
...