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SquirrelMail is a PHP-based Web email client. It includes built-in pure PHP support for IMAP and SMTP, and renders all pages in pure HTML 4.0 for maximum compatibility across browsers. It has strong MIME support and a flexible plugin system.
NOCC is a simple and fast Webmail client which can handle POP3 and IMAP mailboxes and sends email via SMTP. It is written with PHP, has low requirements (no database, frames). Features multi-language support, MIME attachments, displays HTML messages.
The installation guide comes with the source code:
https://sourceforge.net/p/nocc/code/HEAD/tree/trunk/webmail/docs/INSTALL
If you encounter problems or bugs you can always try the current HEAD...
Powerful Open Source Email Marketing app with analytics & segmentation
phpList delivers Open Source email marketing, including analytics, list segmentation, content personalisaton and bounce processing. Extensive technical features and a secure and stable codebase are the result of over 17 years of continuous development.
Used in 95 countries, available in 20+ languages, and used to send 25 billion email campaigns last year.
Deploy it with your own SMTP server, or get a free hosted account at http://phplist.com.
Deploy in 115+ regions with the modern database for every enterprise.
MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
Roundcube Webmail is a browser-based, multilingual IMAP client with an application-like user interface. Roundcube provides the full functionality you'd expect from an email client, including MIME support, address book, folder manipulation, message searching, and spell check. Roundcube is written in PHP and JavaScript.
SWM (Secure WebMail) is an applet that provides confidentiallity and authentication in webmail applications using SHA/RSA algorithms. It can accompany virtually every webmail application, but comes with a plugin for squirrelmail and can run standalone.