SMM:08-90
Sendmail Installation and Operation Guide
SM_CONF_SHM
Compile in support for shared memory, see section about "/var/spool/mqueue".
MILTER
Compile in support for contacting external mail filters built with the Milter API.
There are also several compilation flags to indicate the environment such as "_AIX3" and
"_SCO_unix_". See the sendmail/README file for the latest scoop on these flags.
6.2. Parameters in sendmail/conf.h
Parameters and compilation options are defined in conf.h. Most of these need not normally
be tweaked; common parameters are all in sendmail.cf. However, the sizes of certain primitive vec-
tors, etc., are included in this file. The numbers following the parameters are their default value.
This document is not the best source of information for compilation flags in conf.h -- see
sendmail/README or sendmail/conf.h itself.
MAXLINE [2048]
The maximum line length of any input line. If message lines exceed this
length they will still be processed correctly; however, header lines, configura-
tion file lines, alias lines, etc., must fit within this limit.
MAXNAME [256]
The maximum length of any name, such as a host or a user name.
MAXPV [256]
The maximum number of parameters to any mailer. This limits the number of
recipients that may be passed in one transaction. It can be set to any arbitrary
number above about 10, since sendmail will break up a delivery into smaller
batches as needed. A higher number may reduce load on your system, how-
ev er.
MAXQUEUEGROUPS [50]
The maximum number of queue groups.
MAXATOM [1000] The maximum number of atoms (tokens) in a single address. For example, the
address "eric@CS.Berkeley.EDU" is seven atoms.
MAXMAILERS [25]The maximum number of mailers that may be defined in the configuration file.
This value is defined in include/sendmail/sendmail.h.
MAXRWSETS [200]The maximum number of rewriting sets that may be defined. The first half of
these are reserved for numeric specification (e.g., ``S92''), while the upper half
are reserved for auto-numbering (e.g., ``Sfoo''). Thus, with a value of 200 an
attempt to use ``S99'' will succeed, but ``S100'' will fail.
MAXPRIORITIES [25]
The maximum number of values for the "Precedence:" field that may be
defined (using the P line in sendmail.cf).
MAXUSERENVIRON [100]
The maximum number of items in the user environment that will be passed to
subordinate mailers.
MAXMXHOSTS [100]
The maximum number of MX records we will accept for any single host.
MAXMAPSTACK [12]
The maximum number of maps that may be "stacked" in a sequence class
map.
MAXMIMEARGS [20]
The maximum number of arguments in a MIME Content-Type: header; addi-
tional arguments will be ignored.
MAXMIMENESTING [20]
The maximum depth to which MIME messages may be nested (that is, nested