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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.
Beginning of January 1st 2024 this rule WILL be enforced. Posts that are not tagged will be warned and if not fixed within 24h then removed!
Look at ISPConfig.
It isn't simple but has all of the services you require:
postfix (SMTP)
dovecot (IMAP)
LMTP
MySQL databases for management
Web-based management interface