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所以是 Stalwart
All-in-one Mail & Collaboration server
★ 8.4K Mail Collaboration Calendar License: AGPL-3.0Stalwart is an open-source mail & collaboration server with JMAP, IMAP4, POP3, SMTP, CalDAV, CardDAV and WebDAV support and a wide range of modern features. It is written in Rust and designed to be secure, fast, robust and scalable.