Chapter 24. The O (Options) Configuration Command
Options affect the operation of the sendmail
program. Options can be specified in the command line, in the
sendmail.cf file, and in the
mc configuration file. Options can change, tune,
or affect:
Locations of all the other files that sendmail
needs to access, such as the aliases file.
Locations of queue directories and the use of queue groups. Time limits that should be applied to the TTL in the queue, the
length of time to wait for an SMTP connection, and so on.
Default permissions for files and the default user and group
identities to use when not running as another user.
Degree of privacy desired, such as what kinds of inquiry to reject or
who can examine the queue.
Modes of behavior, such as always queuing or running as a daemon and
listening for incoming connections.
Limits that should be placed on system resources. Should one queue
only under high load? Should one reserve minimal space in the queue?
Small bits of sendmail's
behavior, such as allowing colons to appear in addresses and
stripping newlines from sender addresses.
Most options are preset in your sendmail.cf file
to be appropriate for your site. Those that need local definitions
will usually be indicated by comments. Some sites,
especially those that have high mail loads or those connected to many
different networks, will need to tune many of the options according
to their unique needs.
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