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...It supports the SMTP, POP3 and IMAP (in a simple form) protocols. Furthermore, among much other features, it is capable of showing HTML mails and can identify spam mails by using a Bayesian filter.
The ploinMailFactory is a mailing framework that provides extended features like a templating mechanism, multitenancy and localizaion. Internally it uses the commons-email API from Apache.
ThunderRetract implements client-side eMail retraction into Thunderbird. This is done showing messages differences in original and retracted one. Support: thunderretract@gmail.com
Attachment Reminder is an Add-On (extension) for Mozilla Thunderbird that scans outgoing email for user-defined keywords (or just use the default list), and prompts you if it looks like you wanted to attach a file but didn't.
Spamato is a spam filter system that combines several anti-spam techniques, from which thousands of users benefit. It is available as an add-on for Thunderbird and Outlook, and as a stand-alone proxy for other email clients. IMAP and POP are supported.
With Tiger Envelopes you can stop snoops from reading your email. Same email client. No extra steps. One click to install on Windows and Linux. Configures Outlook, Thunderbird, and KMail. Supports GPG, PGP, Bouncy Castle encryption.
Heirloom mailx (formerly known as "nail") is intended provide the functionality of the POSIX mailx command with additional support for MIME messages, IMAP (including caching), POP3, SMTP, S/MIME, message threading/sorting, scoring, and filtering.
CPO is a tool written in Java that manages newsletters. It's focused on corporate needs (privacy, scalability, bounce count, opt-in & out, newsletter statistics).
Mailbox Sweeper is a program to connect to a mailbox, preview and delete selected messages. Useful for cleaning up mailboxes without downloading all the mails to your computer, e.g. for dialup users who do not want to download that 5MB attachment.
NOTICE: Keep in mind that POP3ye is alpha software and by definition it is a long way from finished.
POP3ye is a fully featured web-based e-mail client written in Object Oriented PHP 5. It ony supports the POP3 protocol.
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.
The MFlow project aims to create a modular messaging client in Java. Its architecture should make it as easy as possible to add support for new protocols, as well as maximizing configurability.
IMAPAssassin is a SpamAssassin enabled IMAP client that allows a user to filter any IMAP mailbox for spam from any computer connected to the Internet. You needn't have any access to the IMAP server and you don't need to run a mail server to filter mail
...Its main distinctive feature is mounting message folders (like POP3 or IMAP) into a virtual folder tree, just like on Unix. Other features: macros language (w/ BeanShell) and extensive filter rules.
Ardok Mail reader (ARM) is a mail checker written in perl/tk.
The main goal of the programm is to manage the mails sent on a pop3 server. But it can also be used to write and read mails (on the server or on the hard drive).
TenForTwo has already been through 3 major interations. It was a closed source Win32 E-Mail client. Now, I will realize, what I planned months ago: build the ultimate Win & Linux E-Mail client that will be easy - stable - secure.
Mail-Lite is a php server side (mobile) email reader interface.You can view and manage your server based imap email from any browser. Use this program to view,edit, delete, write, or filter spam when you are away from your home or office computer.