15.3. Mail queue directory: /var/spool/mqueue
The mail queue is a directory that stores data and controls files for mail messages that the sendmail command delivers. By default, the mail queue is /var/spool/mqueue. Mail messages may be queued for several reasons. First, the sendmail command can be configured to process the queue at certain intervals rather than immediately. If this is so, mail messages must be stored temporarily. Second, if a remote host does not answer a request for a mail connection, the mail system queues the message and tries again later.
15.3.1. Printing the mail queue
The contents of the queue can be printed using the mailq command (or by specifying the -bp flag with the sendmail command). This produces a listing of the ...
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