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Citadel is a collaboration suite (messaging and groupware). It provides support for Email, Calendaring/Scheduling, Address books, Bulletin boards, Mailing List Server, Instant Messaging, Wiki, Multiple domain support.
James (a.k.a Java Apache Mail Enterprise Server) is a 100% pure Java SMTP and POP3 Mail server, and NNTP News server designed to be a complete and portable enterprise mail/messaging engine solution based on currently available open messaging protocols.
listmonk is alpha software and may change and break. Use with caution. That said, it has been in active use at zerodha.com for several months where it has processed hundreds of campaigns and tens of millions of e-mails. listmonk is a standalone, self-hosted, newsletter and mailing list manager. It is fast, feature-rich, and packed into a single binary. It uses a PostgreSQL database as its data store.
nanolist is a lightweight mailing list manager written in Go. It's easy to deploy, and easy to manage. It was written as an antithesis of the experience of setting up other mailing list software. nanolist is controlled by emailing nanolist with a command in the subject.