The text associated with a particular deferred destination in a message originates in a transport agent. The scheduler annotates the transport agent messages with retry information when an address has been scheduled for later delivery attempts, or with text stating why a retry that should have happened was delayed. A lack of annotations indicates a delivery attempt is in progress. The normal action is to print the transport queue. This option is only useful if mailq can read the message control files in the postoffice.
Most users can only see the data for their own messages.
The first two are determined by scanning the appropriate directories and counting files, whereas the status of the transport queue is retrieved from the running scheduler process. Doubling this option will cause mailq to exit after printing this summary. This option is usually only useful to the Postmaster on the system. This will override the verbose option. There can be multiple processes, and they are listed comma-separated inside the curly brackets.