Why not postfix?
Self Hosted - Self-hosting your services.
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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I like to use hmailserver just because it's very easy to set. But being discontinued i keep it inaccessible from outside the network.
If you set up MX records inside your intranet you can go for a really simple setup with postfix. https://www.postfix.org/VIRTUAL_README.html#local After that you should be able to use mutt on the command line via ssh on your postfix virtual server to read the email. If you want webmail though, things will take more time and reading howtos ;-)
Have you looked into self-hosting NextCloud or OwnCloud?
From what I understand nexcloud isn’t a mail server, only a client. I’d need something that can act as an SMTP bridge to actually send emails.
It provides a web interface for mail (and other useful services). You configure it to send outgoing messages through SMTP, qmail, Sendmail, Postfix, Dovecot, take your pick for the back-end.