Netscape Messenger
With the advent of Communicator Netscape's Email client can really be called "full-featured" with its support for most of the current standards (including S/MIME) and platforms (OS/2??).
All Technical Notes about Communicator 4.x
In this long list of questions and answers about Communicator you will also find some pertaining to Messenger (interestingly also some that do not show up in the FAQ listed below) -- if you take a close look.
CNET Reviews - Netscape Messenger
In CNET's comparative reviews of email clients excels with tight Web integration but that's about all where Netscape's Messenger can match its competitors; especially the mail management is all but perfect, they say.
E-mail with Netscape Messenger
The Dordt College provides this introduction to using Messenger. It is shorter and not as detailed as the tutorial from Key Point below but can still guide you in the right direction.
Frequently-asked questions about using mail with Netscape Navigator and Communicator
Netscape's selection of questions about its mail support in both Navigator and Communicator is not extremely big but comes with mostly satisfying answers.
mozilla.org: mail and news
Messenger 5.0 is an open source development and mozilla.org is the place to jump in and start coding.
Navigator Third-Party Mail and News SDK
The Third-Party Mail and News SDK describes how to make email and news clients work with Navigator Standalone (Windows, Unix and MacOS). No, this is not directly Messenger-related.
Netscape Messenger Tutorial - Key Point Software
This tutorial is an excellent place to get started (literally, too) with Messenger; step by step and decorated with screenshots you learn how to send and receive mail, but also more advanced operations such as mailing lists and filters.
PC Magazine: Netscape Messenger (5/5/98)
PC Magazine reviews Messenger and finds an easy to use client with good standards support but not without annoying flaws.
