I have run my own mail server now for 20+ years. its is runnig postfix , with spamassain. the users have imaps, and roundcube www gui.
It had been running fine, and have been updated HW / OS a lot of time over the years, now its runnig on rocky O/S
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I’m in a similar boat. The only major issue I’ve found people are likely to run into is mass IP blocks from MS/Google. Where do you host it? Cloud provider these days or colo type place?