[1] Personal Interface for Networkwide Email - Email-System der University of Washington für PC's und UNIX, behandelt u.a. IMAP und MIME

[2] Pine Is No-longer Elm (synonym zu 1.), s. elm)

[3] Program for Internet News and Email (synonym zu 1.)) pine - Personal Interface for Networkwide Email - Email-Programm (http://www.desy.de/cgi-bin/man-cgipine)