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mqueue(4)
NAME
  mqueue - Contains the log file and temporary files associated with the
  messages in the mail queue

SYNOPSIS
  /usr/spool/mqueue

DESCRIPTION
  The /usr/spool/mqueue directory contains temporary files associated with
  the messages in the mail queue and may contain the log file.	Temporary
  files have names that include the mail queue ID (MQID) of the message for
  which the file was created:

  dfMQID    Data file

  lfMQID    Lock file

  nfMQID    Backup file

  qfMQID    Queue control file

  tfMQID    Temporary control file

  xfMQID    Transcript file for session

RELATED INFORMATION
  Commands: sendmail(8)

  Daemons: syslogd(8)