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Client daemon to move mail from POP and IMAP to your local computer
Fetchmail is a mail retrieval daemon that can download messages from POP3, IMAP, ODMR and ETRN-based stores, with SSL/TLS security including certificate verification, and pass downloaded mail to a local SMTP or LMTP server, or a message delivery agent such as maildrop.
SMTPUTF8 is email programs that can support internationlized email addresses in UTF-8.
SMTPUTF8 permits the use of email addresses that include non-ASCII characters such as Chinese, Japanese, and Korean (CJK).
Virtual Qmail - virtual domains management system for qmail. It is designed to be fast, reliable, and easy to use. Includes software allowing users to manage their accounts via WWW.
PyWebMail is a Python library and POP3 gateway that enable working with WebMail servers like with POP3 or IMAP mail server. Currently Mail.Com, Yahoo! Mail, Gmail, Netscape.Net, HotMail and some minor servers support is finished.
gavamail is a POP3/IMAP server implemented in JAVA for reading your gmail e-mail with your favorite mail client. Currently only POP3 is implemented but I hope to implement IMAP too. Libraries provided by the g4j and libgmail projects are used.
Active Spam Killer for Windows (AfW) is a challenge/response spam filtering system for the Windows platform. Based on ASK for Linux by Marco Paganini, this project adds a POP3 client/server wrapper and web administration, as well as Windows compatibility
ISOS is an e-mail and web server. It is designed for ease of use and provides a quick way to e-presence for small businesses and organizations who lack the experience to benefit from high performance, open source software such as Sendmail, Courier Mail,
FrozenPop is a simple and easy to use POP3/SMTP server. Geared to accommodate multiple domains without having to create individual system accounts, FrozenPop installs < 5 mins. With MySQL authentication, creating users is simple.
mailgate is a set of Python scripts we used at my former company to transfer email a) from a POP3 account to our internal mail server, b) from a POP3 account to a mailbox file and c) from a mailbox file to a SMTP server.
JEEPERS (Jason's Extra Easy to Program Email Response System) uses a POP3 email account to monitor email for command phrases in subject lines. Default commands for remote file storeage and retrival. (Nothing to do with mailing lists or mass emailing.)