OID value: 1.3.6.1.4.1.42.2.27.2.1.15
OID description:
OID for LDAP email alias expansions as proposed in Anil Srivastava's IETF draft, which expired without receiving RFC status. Fairly widely used, distributed in schema files supplied with Netscape, OpenLDAP and Sun LDAP servers. Not as common as the Lachman (LASER) schema, though.
There is currently no useable RFC standard for email objects in LDAP. Lachman/Srivastava, Mozilla, sendmailMTA, and "roll your own" systems abound.
URL for further info: http://www.ietf.org/proceedings/43/I-D/draft-srivastava-ldap-mail-00.txt
See also the OID Repository website reference for 1.3.6.1.4.1.42.2.27.2.1.15