That form looks like this:
FM@ldap:-k (&(objectClass=virtHosts)(host=*)) -v host
F{MY_NAMES}@ldap:-k (&(objectClass=virtHosts)(host=*)) -v host
Here, sendmail gets the list of virtual domains it will manage from a Lightweight
Directory Access Protocol (LDAP) database.
File class macros are covered in Chapter 22 on page 854.
1.8.4.7 Options
Options tell the sendmail program many useful and necessary things. They specify
the location of key files, set timeouts, and define how sendmail will act and how it
will dispose of errors. They can be used to tune sendmail to meet your particular
needs.
The O command is used to set sendmail options. An example of the option command
looks like this:
OQ/var/spool/mqueue
O QueueDirectory=/var/spool/mqueue ?†? beginning with V8.7
Here, the Q option (beginning withV8.7 called QueueDirectory) defines the name of
the directory in which mail will be queued as /var/spool/mqueue. Multicharacter
option names, suchas QueueDirectory, require a space following the initial O to be
recognized. Options are covered in Chapter 24 on page 947.
1.8.4.8 Headers
Mail messages are composed of two parts: a header followed (after a blank line) by
the body. The body can contain virtually anything.* The header, on the other hand,
contains lines of information that must strictly conform to certain standards.
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