Recent Useful Commands

Check Maillog and Mail Queue (Postfix Mail Server)
#mailq
 #tail  -f   /var/log/maillog

Delete a message from postfix mail queue

 #postsuper   -d  1FD3D2F8BAE <---- MailID

Flush Messages
#postfix   flush


find out about your Postfix version to make sure it supports custom bounce messages:

postconf -d | grep mail_version
 
maximal_queue_lifetime: The maximal time a message is queued before it is sent back as undeliverable.
delay_warning_time: The time after which the sender receives the message headers of mail that is still queued.

The postconf -n command shows the settings that are currently configured in /etc/postfix/main.cf, whereas the postconf -d command shows the default settings that are valid unless something else is set in /etc/postfix/main.cf.

To find out about the current value of maximal_queue_lifetime, you can run

postconf -d | grep maximal_queue_lifetime
postconf -n | grep maximal_queue_lifetime 

If postconf -n doesn't display anything, this means the value from postconf -d is currently being used:

server2:~# postconf -d | grep maximal_queue_lifetime
maximal_queue_lifetime = 5d
server2:~# postconf -n | grep maximal_queue_lifetime
server2:~# 

The same goes for delay_warning_time:

postconf -d | grep delay_warning_time
postconf -n | grep delay_warning_time

server2:~# postconf -d | grep delay_warning_time
delay_warning_time = 0h

server2:~# postconf -n | grep delay_warning_time
server2:~#

If you want to modify these settings, you can use the postconf -e command. It will write the settings to /etc/postfix/main.cf, e.g. like this:

postconf -e 'maximal_queue_lifetime = 1d'
postconf -e 'delay_warning_time = 0h'

Parameters minimal_backoff_time, maximum_backoff_time and queue_run_delay maximal_backoff_time (default: 4000s) The maximal time between attempts to deliver a deferred message. This parameter should be set to a value greater than or equal to $minimal_backoff_time. See also $queue_run_delay. Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is s (seconds).

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Windows 2003 commands

Check local users & groups
#lusrmgr.msc
#net  user
 
Change properties local users
#control   userpasswords2

security\Sam\domain\account\users\names