b1gMail is a free, open-source, self-hosted PHP webmail and groupware system for running your own branded email service with calendar and contacts.
b1gMail is a self-hosted PHP application for operating a private email service, created by Patrick Schlangen. It began as freeware, later shifted to a commercial license from version 6 onward, and returned to a fully open-source GPL license as of version 7.4.1, removing all proprietary components.
Because it runs on standard PHP hosting rather than requiring dedicated infrastructure, b1gMail is accessible to individuals, businesses, and hosting providers who want to run their own branded email and groupware service instead of outsourcing it to a third-party provider.
The platform combines webmail with an HTML5 drag-and-drop interface, an address book, calendar, task and note management, and cloud storage. Optional modules add SMS and fax capabilities.
Spam and virus protection is built in through DNSBL filtering, a Bayesian spam filter, and ClamAV antivirus integration, and administrators can extend functionality further through a plugin system and customizable mail filters.
b1gMail is free and open source under the GPL license as of version 7.4.1. There is no official paid tier or managed hosting; users deploy it on their own PHP-capable web hosting.
Yes, as of version 7.4.1, b1gMail is fully open source under the GPL license with no cost.
Yes, b1gMail is self-hosted and runs on standard PHP web hosting.
Yes, it includes an address book, calendar, task management, and notes alongside webmail.
The core community and site are primarily German-language, though English resources exist.