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Self Host Intranet Email
(lemmy.ca)
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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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.