OpenMail is HP's reliable, scalable, easy-to-manage, UNIX messaging server. It was designed for the heterogeneous communications environments typically found in large enterprises and is currently used by many world-class companies as the basis of their communications infrastructure. OpenMail supports transport standards such as SMTP/MIME, client access standards including MAPI, POP3 and IMAP4, and directory standards including LDAP and X.500.