this post was submitted on 13 Sep 2024
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Linux + postfix (SMTP) + dovecot (IMAP and POP3) + SPF + DKIM on the host
Point the MX record for your domain to your IP address
Contact your ISP and ask them to set the PTR record for your IP to your hostname
Mail can be handled by a very low end computer, a raspberry pi can handle email for a small number of users
If you have a specific mail machine you would forward the ports you use to that host on your router.