DixieMail
SMTP and POP3 email server. [Freeware, source available]
url: www.geocities.com/Yosemite/Trails/3725/dixiemail.h...
JAMS
Java mail server. Uses a JDBC database (free database InstantDB is provided) to store messages. [Open Source, GPL]
url: www.kimble.easynet.co.uk/jams/
Java Apache Mail Enterprise Server (JAMES)
Fully-featured mail server which handles both transport and storage, and allows for easy extensibility using MailServlets (for example: send mails as fax or voice, filter mailets, translator, mailling list, newspaper via mail). [Open Source, BSD-like]
url: james.apache.org/
JEmail
Very simple smtp pop3 java email server implementation with source. [Open Source,GPL]
url: sourceforge.net/projects/jemail
Newsletter Dispenser Server
Newsletter software capable of publishing e-mail newsletter and maintaining the subscribers. This newsletter software written in Java, provides stats and analysis for the published newsletters. [Commercial]
url: www.newsletterdispenser.com/
POP3 Proxy
Server which allows access to POP3 mailboxes for users who don't have direct access to them. It can be used for accessing POP3 mailboxes from multiple computers even if only one of them has a dial-up connection to Internet. [Freeware]
url: home.tiscali.cz:8080/~cz210552/pop3proxy.html
Refer's Java POP3 server
A very simple example of a POP3 server in java. [Open source]
url: home.wanadoo.nl/efx/java/pop3/
SMTP Proxy
SMTP mail relay. [Freeware]
url: home.tiscali.cz:8080/~cz210552/smtpproxy.html
