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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.
Postak is Java web based mail client. Main purpose is to provide access to POP3 and IMAP mail services and also to provide functionality for sending e-mail via SMTP protocol.
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eemailer is a free email client with IMAP, POP3 and local folder functionality. It has a built-in HTML3.2 compliant webbrowser and integrated SMTP engine.
eemailer is completely written in delphi.
Carassius is an Email client unlike any other. In addition to a new intuitive approach to the regular email protocols (POP3, IMAP, SMTP), Carassius also handles the major Webmail services including Gmail, Yahoo! Mail & Hotmail.
MadMail is a simple Webmail client which can handle POP3, SMTP, and IMAP servers.
It is written with PHP (Sessions) an can displays HTML messages and MIME attachments.
Features multi-language support
No Database required
Gumnu is a mail client for low bandwith (WAP enabled) mobile devices written in PHP. It has a framework for separating the (WML,HTML) interface from the rest of the project. It uses gettext for i18n, IMAP/SMTP provided by php, MySQL for settings.
MyMailBox is an email client written in Java,featuring a user-friendly graphical interface with wizards and internalionalization support.It supports IMAP,POP3 and SMTP.
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CaMail is a web based mail system written in Perl (using Apache mod_perl) and Template Toolkit.
It supports multiple IMAP/SMTP servers along multiple domains and addressbook via LDAP.
In adition, LDAP is used to store sessions, groups, message filters
Teak is an GUI IMAP (could also do POP3 and NNTP with some work) mail client written in php-gtk (gtk.php.net). It's still in the early stages of development but already can read/send mail via an IMAP server and local SMTP host.
YANOCC is a simple and fast webmail client which can handle POP3, SMTP, and IMAP servers. YANOCC is based on NOCC's code and is written with PHP4. It features multi-language support, MIME attachments, displays HTML messages, address book, folder support.
A Full Featured E-Mail client with support for SMTP, POP3, Full IMAP, LDAP support for a global address book (anonymous and authenticated) unlimited private address books, todo lists, a personal calendar, spell checking support.
Gnome-Jupiter is planned to become a MUA supporting multiple POP3-Accounts.
First aim is a stable SMTP/POP3 combination. IMAP is planned for the
future.
Spicebird is an open-source email and collaboration suite based on the Mozilla platform. It provides integrated e-mail, contacts, calendaring and instant messaging. It can connect to any SMTP/IMAP email server, CalDav Calendar server and Jabber serve