Stalwart

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

#2,848 in Collaboration

About

Community size

1.77Kmembers

Member growth

Net change: +0
7-day rate: +0.00%

Oct 4 – 11, 2026

About this data

Approximately 1,771 members in this snapshot.

Membership was unchanged between October 4, 2026 and October 11, 2026.

Ranks #2848 by membership among 3,650 Collaboration servers tracked by Deepcord.

Member change includes joins and departures across observations roughly a week apart. The growth rate is normalized to seven days.

Last observed: October 11, 2026. Compared with October 4, 2026.

Server Details

Stalwart Mail Server is an open-source mail server solution with JMAP, IMAP4, POP3, and SMTP support and a wide range of modern features. It is written in Rust and designed to be secure, fast, robust and scalable. Stalwart Labs' mission is to help modernize, democratize and promote decentralization of email by creating an open-source mail server in Rust that is simple to run but at the same time extremely secure, robust and focused on privacy.