MTA options listed by functional group

Table of MTA options, listed by functional group, shown below, lists the available MTA options, grouped by functionality. A brief description of each option is included, though more details can be found in the discussions of each individual MTA option, and in the discussions of functional groups of MTA options. See also Table of MTA options, listed alphabetically, which lists the MTA options alphabetically.

Options that fall into more than one category (as is frequently the case) are listed under each of the groups, except for the LDAP attribute name (schema) options which, due to their extensive number, are listed only in the LDAP attribute name (schema) options section of the table.

 +Note that the MTA&#x27;s SMTP AUTH user authentication lookups are done using general  authentication library code,  also used for IMAP, POP, or mshttpd  user logins (authentication). The authentication library code generally does not make use of the  MTA-specific options, but rather is controlled by  Auth options (or in legacy configuration, configutil parameters). However, for a few specific cases of MTA options affecting authentication library operation, see the Direct LDAP attributes returned upon authentication MTA options.

See also:
 * MTA options
 * MTA options listed alphabetically
 * Option value syntax
 * Legacy configuration MTA option file
 * Getting option changes to take effect on the MTA