Ldap_detourhost_optin MTA option
Direct LDAP attribute name MTA options:
ldap_detourhost_optin (LDAP attribute name)
ldap_detourhost_optin MTA option specifies the name of a user or group LDAP attribute which may be used to specify "opt-in" to "detour" routing, as specified by the
aliasoptindetourhost channel option. Normally the presence of the specified attribute on a user or group entry causes "opt in", however, see the
aliasdetourhost_null_optin MTA option.
Note that there is a domain level analogue,