Outlook Help is a self-service portal for users to find guides, documentation, and troubleshooting resources for Microsoft Outlook. It provides technical information and support for Outlook desktop, Outlook mobile, and Outlook on the web.
Rainloop is an open-source and web-based email client for web servers that supports multiple email accounts and protocols. It is designed to be lightweight, fast, and customizable with a modern user interface.
Sympa is a web-based software that enables efficient management of mailing lists, with features including automated subscription management, message templates, and customizable permission control. It is written in the programming language Perl and is distributed under the GNU General Public License.