xmh, an X interface to mh, is distributed with the X11 releases. The xmh
program provides a graphical user interface to the MH Message Handling System.
Electronic mail messages may be composed, sent, received, replied to,
forwarded, sorted, and stored in folders. xmh provides extensive mechanisms for
customization of the user interface.

exmh is a TK-based user interface to MH mail. It supports arbitrarily nested
folder structures, and it helps you find new mail if you pre-sort it into
different folders as it arrives. It parses MIME messages and has a limited MIME
composition facility. You can hook it up to your favorite editor, or use its
built-in editor. exmh is extensible via Tcl programming and X resource-based
button and menu specifications.  The contact for exmh is bwelch@eng.sun.com
(Brent Welch). Sources for version 1.6.5 (for tk 4.0) are on 
http://www.sunlabs.com/~bwelch/exmh/ [3/96].

Xmail is an X-based window interface to Berkeley-style mail handlers; it is
styled primarily after the Sunview mailtool application and builds on most
Unix systems. The current release [6/95] is 1.6; older versions are available
in the X11R5 contrib tape and from ftp.x.org
(contrib/applications/xmail_1.6.tar.gz) . Info: Jeff Markham,
markham@cadence.com.

XF-mail is an XForms-based MH mail-reader for X; it was created using the
XForms library. The interface is configurable through the user interface
itself. XF-mail retrieves mail via POP or from a spool file; it sends via
sendmail or SMTP. Sources are available at
ftp://ftp.x.org/contrib/applications/ .

thsmail, by Thomas Schaller (ths@thshome.erls02.siemens.de), is a Motif-based
Mail User Agent for RFC822 and MIME messages. The Linux version is freeware;
try ftp://ftp.erls02.siemens.de/pub/linux/thsmail/ .

MMH (My Mail Handler), a motif interface to the MH mail handler, is available
from ftp://ftp.eos.ncsu.edu/pub/bill/bill.tar.Z ; it is bundled with
the TED editor, which it uses for composing messages. Motif 1.1 is required; if
you don't have it, look for DEC and SPARC executables in the same place.
Information and problems to: Erik Scott, escott@eos.ncsu.edu. [1/92]

The Andrew Toolkit supports the Andrew Message System; it is available from
ftp.x.org and many other X archives and from ftp://ftp.andrew.cmu.edu/pub , 
or send email to susan+@andrew.cmu.edu.  You may be able to
use the Remote Andrew Demo service to try this software; try "finger
help@atk.itc.cmu.edu" for help.

xmailtool is an Xaw-based interface to Mail, BSD's mail reader/sender, 
with some extra features. It has been ported to widely divergent systems.
Sources are on ftp://ftp.x.org/contrib/xmailtool.3.1.2b.tar.Z [3/96].
Information: Bob Kierski, bobo@cray.com (who mentions that development is
temporarily suspended).

MuMail, an X-based elm-like mail program with MIME support and digest
exploding, is available at
ftp://sunsite.unc.edu/pub/Linux/system/Mail/readers/ [3/96].
Information: David Boyd, dave_boyd@sterling.com. 

tkmail, a graphical mail client using tcl and tk 3.6,
is available at
ftp://sunsite.unc.edu/pub/Linux/system/Mail/readers/ [3/96].

tkmr, a read-only tcl/tk mail file browser with search and sort capability, is
available at
ftp://sunsite.unc.edu/pub/Linux/system/Mail/readers/ [3/96]

ML, an IMAP mail client for X11/Motif, provides a full-featured MIME aware
mail/news system with active filtering of messages based on rules which you
define, plus point&click PGP access.  Linux binaries are on
ftp://ftp-camis.stanford.edu/pub/ .

Meuf, a Motif-based MIME Mail User Agent by Daniel Glazman
(Daniel.Glazman@der.edf.fr), is at http://lara0.exp.edf.fr/glazman/MEUF.html
[3/96]. The pages include snapshots of development versions, information on the
project, and up-to-date information on how it evolves. Meuf 3.0 is currently
undergoing beta-testing.

xmailbox 2.4 is an enhanced xbiff and plays sound effects and animation.
Sources are on ftp://ftp.x.org/contrib/applications/ .
[8/96]

coolmail 1.3 is a mail notification utility for UNIX systems running X. Sources
are on ftp://sunsite.unc.edu/pub/packages/mail/ [9/95].

xelm is an xbiff program intended to be used to launch elm or another
mail-reader.  A version is in ftp://ftp.x.org/contrib/utilities/xelm.tar.Z
[3/96].

Also:

The Netscape browser includes a mailer.

Z-Code Software (an NCD company) offers Z-Mail for most Unix systems;
binaries support both tty and Motif interfaces. The mailer includes a
csh-like scripting language for customizing and extending mail capabilities.
Information: 415-898-8649,  info@ncd.com,
http://www.ncd.com/Z-Code/zcode.html [3/96].

Ishmail from Halsoft (ftp.halsoft.com) is available on several platforms.  It
is a MIME-compliant X/Motif-based mailer. See also:
http://www.halsoft.com/products/ishmail/ [3/96].

Several vendors' systems include X-based mailers. DEC offers dxmail; Sun
offers an X-based mailtool; SCO (info@sco.com) includes SCOmail in its Open
Desktop product. HP offers the MPower product.

Several integrated office-productivity tools include mailers:

The Applixware office integration tools from Applix (1-800-8APPLIX, MA:
508-870-0300) include a mailer.