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GreenMail is an intuitive and easy-to-use test suite of email servers for testing purposes. Supports SMTP, POP3, IMAP with SSL socket support, and configurable user accounts and credentials. All in 100% Java.
WE'VE MOVED TO GIT HUB: https://github.com/greenmail-mail-test/greenmail
SPIZD stands for Stress Probing Invasive Zap Destructor; it's a command-line stress test tool used to determine how many simultaneous (concurrent) connections servers can handle. Protocols: http, pop3, pop3s, imap, imaps, smtp, smtps, ssh, radius.
Java program that creates an SMTP message and sends it off. It can be used to testSMTP functionality as well as security. This testSMTP at the application level. Requires Java 6.
A webmail-client (POP3, IMAP, SMTP) written in Java as a webapp. Very easy to install - just throw the WAR-file into the deployment-directory of your Servlet-container (tomcat, jetty, weblogic, ..) and you're ready! Test ride on the yawebmail-Homepage!
SmtpUnit is a smtp server written in java to be used for unit testing java code within a enterprise level or stand alone java application to test code that results in an email being sent.
MailRunner is a Java/Swing based email response management testing tool. It automates the sending of email to any SMTP server which can then be used to test the routing and processing of emails. All email are defined in an XML script.