Source : Webster's Revised Unabridged Dictionary (1913)

Addressee \Ad`dress*ee"\, n.
   One to whom anything is addressed.

Source : WordNet®

addressee
     n : one to whom something is addressed

Source : Free On-Line Dictionary of Computing

addressee
     
         One to whom something is addressed.
        E.g. "The To, CC, and {BCC} {headers} list the addressees of
        the e-mail message".  Normally an addressee will eventually be
        a {recipient}, unless there is a failure at some point (an
        e-mail "{bounces}") or the message is redirected to a
        different addressee.
     
        (2000-03-22)