BBDB is the Insidious Big Brother Database for GNU Emacs.  It provides
an address book for email and snail mail addresses, phone numbers and
the like.  It can be linked with various Emacs mail clients (Message
and Mail mode, Rmail, Gnus, MH-E, Mu4e, VM, and Wanderlust).  BBDB is
fully customizable.

This is version 3 of BBDB.