Crossware Mail Signature supports the use of LDAP directories.
(NOTE:- The use of Groups within the LDAP directory in not currently supported)

The use of LDAP in Domino is by Directory Assistance. Your LDAP Directory must be enabled on the server where the signature application is installed.

By default the lookups supplied with the Mail Signature are based on dblookup to extract information from the names.nsf database. BUT, any lookups that use LDAP need to be of type 'Name'.

NOTE, you may need to modify the configuration of your LDAP directory to make additional information available.

See Domino Default configuration for fields that are available when domino is an LDAP server