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There are a few out-of-the-box Linux solutions packed with everything, like Modoboa, mailcow, iRedMail, etc.
The issue is that IP reputation is super important in the Email world, it will be very difficult to build that reputation otherwise 60/100 of emails will end up in spam. I did host some mail servers for a national institution years ago, and delivery was OKish but yeah you need a static IP with reverse with a high authority domain(preferably with gov status), DKIM, DMARC, SPF, whitelists and at least 1 year of good behavior.
IMO if is a small firm and is not some institution with critical privacy requirements just use an online provider, Google, or Microsoft, if you want cheaper, Zoho or Yandex.
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