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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.
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
phlyMail is a Webmail and data hosting application. It features IMAP, POP3, SMS, Fax support, a Calendar, Bookmarks, files manager. Multiuser and single user editions available.
Access IMAP-mailboxes automatically, delete spam marked by filtering software like spamassassin, get reports in regular intervals. Additional features: multi mailbox access, extended spam filtering can be integrated, test mode, no database needed.
RSS->IMAP server is a basic IMAP server implementation that allows you to browse your RSS feeds like emails. This is perfect for adding basic RSS functionality to older email clients that do not have RSS readers built in such as Outlook 2003.
JFetcher is a Java Fetchmail application, which is able to fetch emails from a pop3 or imap mailbox and deliver it to another smtp host. The ideal exercise for JFetcher is to fetch emails from a global mailbox for relaying them to local accounts.
IMAP-Agent is an automated IMAP mail folder management system implementing site wide and
individual user specific rules for filtering mail between folders.
Also, quotas can be maintained by age or max count of
messages for any folder.