I think TenFour’s suggestion about initially running a mail server just for yourself was excellent advice. I keep an email server running for testing purposes and as a backup.
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Originally Posted by nosim
I think I would want a security hardened and stripped down BSD flavoured OS.
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My preferred email server setup is OpenSMTPD-Dovecot-Rspamd running on an OpenBSD server. You will, however, find far more tutorials and online trouble-shooting discussions for Postfix-Dovecot-Spamassassin running on Debian-based servers. I, personally, don’t think I would ever offer email services to others, but best wishes if you decide to take that plunge.