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. Key features: JMAP, IMAP4, POP3 and ManageSieve server: JMAP server with Sieve Scripts, WebSocket, Blob Management and Quotas extensions. IMAP4rev2 and IMAP4rev1 server with support for