jwma (java webmail app) uses jakarta mail (formerly javamail) to provide access to an imap email store. Multiple users can authenticate, read, send and manipulate email storage and persist a list of contacts, email identities and their own individual preferences.
It works with email stored in mbox or maildir format or stored in a derby database; it has been tested with dovecot.james and exim4.
WebMail is a Java Servlet application that gives users WWW access to their IMAP/POP mailboxes. It supports folders, multiple languages, composing messages, MIME and virtual domains.
Public Computing Services strives to provide essential information management to families that can't afford commercial software. Browser-based applications help users manage health, communications, education, legal, financial, home and employment data.
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JFoxMail is a opensource J2EE webmail application. Access to read from IMAP account, Compose using SMTP, and Address Book management using LDAP is supported.
An email client written in Java, C, and C++ which not only allows standard pop/smpt/imap access, but also integrated access to Yahoo!, Hotmail, Lycos, and many others. This is all done without any additional services (such as pop forwarding).