The LDAP_OPTIN1 through LDAP_OPTIN8 MTA options specify LDAP attributes for per-user spam filter opt-in values based on destination addresses. If an option is specified and the attribute is present, it is appended to the current spam filter opt-in list. Any values set by the domain level attribute set by the LDAP_DOMAIN_ATTR_OPTIN MTA option will also be appended to the list. LDAP_SOURCE_OPTIN1 through LDAP_SOURCE_OPTIN8 provide comparable originator-address-based per-user spam filter optins.
The LDAP_PRESENCE MTA option can be used to specify a URL that can be resolved to return presence information about the user. If the option is specified and the attribute is present, its value is saved for possible use in conjunction with Sieve presence tests. The domain level attribute set by the LDAP_DOMAIN_ATTR_PRESENCE MTA option is used as source for this URL if no value exists for the user entry.