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Old 10th Jul 2022, 10:50
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awair
 
Join Date: Jan 2005
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To give you a general idea of my setup process, based on a static IP:
  1. Repurpose a known, secure distribution of Linux.
  2. Install Webmin for easier configuration
  3. Replace Sendmail with Postfix
  4. Open required ports on server
  5. Redirect ports on separate firewalll/router to email server
  6. Edit DNS settings to provide global MX records
  7. Setup separate virtual host with Postfix for MX Backup
Redundancy is the prime consideration: if your mail server is down or inaccessible, your mail will bounce and can be lost forever.

As Saab Dastard said, there is a lot more to configure for security, that's if your ISP permits traffic through the relevant ports.

Depending on your needs, you may find that a mail host/hub is what you really want? A Dovecot server that can store all your mail for ready access, but cannot send mail. This removes most of the security issues.

Good luck.
awair is offline