QFE - Qt FTN Message Editor for Linux
The world's largest development and download repository of Open Source code and applications
http://sourceforge.net/projects/qfe/

4 Tier Software - OpenMOM message broker
The new generation of message broker for building multi-tiered applications. Cooperation of Business services developed in Java, Visual Basic, Delphi or C++, are performed by OpenMOM message brokers under the form of plug&play communicating components.
http://www.4tier.com/

OSMQ (Open Source Message Queue)
A Java-based, asynchronous peer-to-peer message framework for binary, text, and record-oriented message passing that includes memory management of queues and dynamic discovery of remote readers. [Open source, GPL]
http://www.pojoe.org/osmq/

LookAt Message Help Facility
Main page for LookAt - z/OS message help facility. LookAt improves z/OS message retrieval.
http://www-03.ibm.com/servers/eserver/zseries/zos/bkserv/lookat/

RFC 2298
An Extensible Message Format for Message Disposition Notifications. R. Fajman. March 1998.
http://tools.ietf.org/html/rfc2298

InboxRULES
Control and organize emails with InboxRULES. InboxRULES can help you to save and print emails, parse and extract data from emails immediatelly when email arrives to MS Exchange Server mailbox or MS Outlook account.
http://www.ornicusa.com/

Digital Press
Display luminoso, modelo patentado, cambia el mensaje en 20 segundos
http://www.di-press.com/

RFC 3218
Preventing the Million Message Attack on Cryptographic Message Syntax. E. Rescorla. January 2002.
http://tools.ietf.org/html/rfc3218

Message Realms
Provides paid customizable message board hosting. Offers a 45 day free trial period.
http://www.message-realms.com/

RFC 0841
Specification for Message Format for Computer Based Message Systems. National Bureau of Standards. January 1983.
http://tools.ietf.org/html/rfc841