PUBLIC MARKS with tag imap

IlohaMail (pronounced: e-lo-ha-mail) is a light weight yet full featured multilingual webmail program that is easy to use and install. It runs on a stock build of PHP, and does not require databases (although database support is available) or the IMAP library (it is powered by a custom IMAP/POP3 library).

RoundCube Webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation, message searching and spell checking. RoundCube Webmail is written in PHP and requires the MySQL database. The user interface is fully skinnable using XHTML and CSS 2.

Multi protocol Python/Twisted CMS with a SQLAlchemy based persistence engine

QMAIL + Vpopmail + courier-imap + Qmailadmin + MySql + Spamassassin + clamav + Squirrelmail + stats (Isoqlog, qms-analog, qmailanalog & qmail MRTG) under Linux

IMAPSize is a freeware Windows application that allows you to quickly and efficiently manage your IMAP mail accounts. It is not another mail client.

"The Mailbox Update (MUPDATE) protocol allows a group of [IMAP] or [POP3] servers to function with a unified mailbox namespace".

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"The CATENATE extension [...] extends the APPEND command to allow clients to create messages on the IMAP server that may contain a combination of new data along with parts of (or entire) messages already on the server".