SquirrelMail
Standards-based webmail package written in PHP
SquirrelMail is a standards-based webmail package written in PHP that provides access to email and address books through a web interface. It includes built-in pure PHP support for the IMAP and SMTP protocols, and all pages render in pure HTML 4.0 with no JavaScript required, supporting compatibility across browsers. The package has few requirements and is designed to be straightforward to configure and install.
Core functionality includes MIME handling, address books, and folder manipulation. Extensibility is provided through plugins, with examples including Yubikey Hardware Authentication, SMTP Authentication, Login Authentication, Autocomplete, S/MIME Verification, Custom From, Compose Extras, Password Forget, Multiple Attachments, and Mail Fetch. Security advisories and CVE identifiers are published for known issues across past versions.
SquirrelMail is licensed under the GNU General Public License (GPL), with no license fees. It is described as stable for production use. The project publishes stable releases and nightly snapshot packages for download, with snapshots noted as including compatibility for newer PHP versions.
12 alternatives to SquirrelMail
Ranked by how well each tool replaces SquirrelMail: shared features, audience, price and popularity.
Free and open source webmail software written in PHP
Covers 0 of 7 key features.
Free planOpen source65 out of 100 matchFree- 61 out of 100 match—
- 61 out of 100 matchContact sales
Free and open source privacy focused email client
Covers 0 of 7 key features.
Free planOpen source59 out of 100 matchFreeWindows mail server software providing email and collaboration services, positioned as an
Covers 0 of 7 key features.
Free plan59 out of 100 match$395/moOpen-source mail and collaboration server combining email, calendars, contacts and file in
Covers 0 of 7 key features.
Free planOpen source58 out of 100 matchContact salesNative desktop email client for Mac, Windows, and Linux
Covers 0 of 7 key features.
Free planOpen source58 out of 100 match$8/mo- 57 out of 100 match$4.99/mo
A simple yet full-featured mail server delivered as a set of Docker images.
Covers 0 of 7 key features.
Open source57 out of 100 match—Free PC email system with a modestly priced Internet mail server.
Covers 0 of 7 key features.
Free plan56 out of 100 matchContact sales- 56 out of 100 match—