Support Files

This section provides a summary of the support files that sendmail creates or generates.

/usr/lib/sendmail: The sendmail program.
/usr/lib/sendmail.cf: The configuration file in textual form.
/usr/bsd/newaliases: A link to /usr/lib/sendmail; causes the alias database to be rebuilt. Running this program is equivalent to giving sendmail the -bi flag.
/usr/lib/sendmail.fc: The configuration file represented as a memory image (the "frozen configuration").
/usr/lib/sendmail.hf: The SMTP help file.
/usr/lib/sendmail.st: A statistics file; need not be present.
/usr/lib/sendmail.killed: A text file that contains the names of all known "dead" hosts (hosts that no longer exist or cannot receive mail for some reason).
/usr/lib/aliases: The text version of the alias file.
/usr/lib/aliases.{pag,dir}: The alias file in ndbm format.
/var/spool/mqueue: The directory in which the mail queue and temporary files reside.
/var/spool/mqueue/qf*: Control (queue) files for messages.
/var/spool/mqueue/df*: Data files.
/var/spool/mqueue/tf*: Temporary versions of the qf files, used during queue-file rebuild.
/var/spool/mqueue/nf*: A file used when a unique ID is created.
/var/spool/mqueue/xf*: A transcript of the current session.
/usr/bin/mailq: Prints a listing of the mail queue; using this file is equivalent to using the -bp flag to sendmail.
/etc/init.d/mail: Shell script for starting and stopping the sendmail daemon.
/bin/mail: Program that sendmail uses as the "local" mailer.