[Exim] Exim ldap schema OID

Dear All,

    I saw somebody registered Exim MTA to OID node 1.3.6.1.4.1306
    Is there any well defined ldap schema for Exim already for use? If
we re-invent it, it will cause imcompatibility in the future. Well, if
there isn't a ready made one, probably we have to define it ourselves.
    Any information is grateful.
Kind regards,
Liang

Liang Du
Unix System Administrator
IT Services, University of Dundee