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Hedwig is an open source IMAP, SMTP, POP3 server written in Java, designed with ease of installation and configuration in mind. Hedwig enables storage of mail message headers in a relational database(MySQL or Oracle) and mail messages in a file system.
Visit http://hwmail.sourceforge.net/ for more information.
...CheckeredFlag runs on the local
machine and doesn't need a network connection nor any special set up. Just run
it and that is all. SMTP, POP, and webmail are provided, which means you can send email with any email client and recieve email with just about every email client.
This allows you to run an email "server" that will accept any and all emails and allow you to query them afterwards - similar to the service Mailinator.com provides.
Using this, you can test whether your applications can send emails correctly, and you can retrieve the data out of them (for example if you need to verify that account activation links exist in the outgoing email, and that they work correctly).
The real Mailinator service is better if you are only sending a one-off email. Likewise if your company wants to test emails then they may be better off speaking to Mailinator about commercial offerings. ...
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.
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.
A user-centric Java Mailet for the Apache James mail server (a Java mail server) for the purpose of filtering spam using a naive Bayesian algorithm. As a Mailet, the filter can act upon spam as it is received over SMTP before the user gets it.
JEM is an SMTP server with pluggable components that let you
process email in any way you like. It can also extend beyond
emails into generalised message processing (like JMS) and can
even generate its own messages based on a Cron-like facility.
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.