TLDR
Enter a command. For example: apt mark, fuser, btrfs restore.

postfix

 
Postfix mail transfer agent (MTA) control program. See also dovecot, a mail delivery agent (MDA) that integrates with Postfix. More information: http://www.postfix.org.
 
  • Check the configuration:
     
    sudo postfix check
     
  • Check the status of the Postfix daemon:
     
    sudo postfix status
     
  • Start Postfix:
     
    sudo postfix start
     
  • Gracefully stop Postfix:
     
    sudo postfix stop
     
  • Flush the mail queue:
     
    sudo postfix flush
     
  • Reload the configuration files:
     
    sudo postfix reload
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