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So is 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.
Sure, Dovecot is awesome.
But have you considered these open source alternatives?
They are free, self-hostable and community-driven.
Check by yourself: Stalwart .