Ldap group last access time MTA option

Direct LDAP attribute name MTA options:  (LDAP attribute name)
(New in 8.0.) The  MTA option specifies the name of an LDAP attribute used to keep track of the last access time for email groups defined in LDAP. If this attribute is present in a group&#x27;s LDAP entry, then the MTA will update the attribute each time the group is successfully accessed for purposes of sending mail or expanding a mailing list. RFC 3339 format, an Internet profile of ISO 8601 format, is used, e.g., " ".

In order to prevent excessive LDAP writes, the LDAP attribute named by the  MTA option  is read prior to writing and a write is only done if the current time exceeds the stored time by at least 30 minutes. (A write is also done if the attribute does not contain a valid RFC 3339 time, making it possible to set the initial value to something like " ".)

See also:
 * ISO 8601 format
 * Direct LDAP attribute name MTA options