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...Likewise if your company wants to test emails then they may be better off speaking to Mailinator about commercial offerings. This project is designed for the small developer.
Mailster is a project aimed at testing software mail capabilities. It provides a mail server container to test emails sent by your apps without rewriting your application code.
Self contained email server and web-viewer for helping to test mail based application. What makes this unique is it accepts all email messages, so it is designed to be useful for apps which require many different email addresses to test with.
Jpxx is a lightweight ESMTP/POP3 java mail server. After v0.03, JMS can be run with a separate servlet engine (or application server) such as Apache Tomcat or Resin. It is used to run as a plugin.
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JAmes Ldap List Server. A mailet for the Apache James email server which enables your existing groups in an LDAP directory to be mailed as though they are mailing lists.
SIMON is a very simple MTA and POP3 implementation. It is completely designed from the ground up and is useful for departmental or small to medium sized companies.
SPAM-Buster is a Java application for filtering SPAM based on statistical algorithms (currently Bayesian). The platform independant application can be used as graphical end-user client and additional service for mail server.
Ichabod is an SMTP/POP3 server, with mailing list support. Administration is via a web, or email
You can also use Ichabod to make your app receive email as an SMTP server.
You can also easily extend it by subclassing to add your own behaviors.