Many other guides dive deep into 10 plus pages of how to set up such a service with Dovecot, Postfix and a web server all from the command line, but this one is a lot simpler because most of what you need is inside Citadel. Citadel also has calendar, Contacts, Notes, Tasks and chat rooms so can be a good alternative to Google or other providers. Your only cost really is the Raspberry Pi and a domain name if you don’t already have one.
You could tweak this a bit further by using your own DNS provider (or alternative to Cloudflare) and considering an external hard drive connected to the Pi for reliability.
See https://pimylifeup.com/raspberry-pi-email-server/
#technology #email #privacy #raspberrypi #alternativeto #opensource
And a static IP address may be needed too to ovecome anti-spam services.
When I get my homeserver I’m planning to use a VPS with Wireguard to give it a static datacenter IP to host my E-Mail from home. If the E-Mail traffic is encrypted, even someone with full control over the VPS still wouldn’t be able to get any content