Comment by gspr

> Does anyone recommend any alternate providers with custom domains, or some OSS?

I'm happy with Namecheap as my registrar and Mailbox.org for mail services, and have been for years (my Gmail account still exists and forwards the rare message it receives to the other one).

Mailbox.org offers ordinary IMAP and SMTP access + DKIM signing for your domain. Hosted in Germany. Prices vary, I pay about €2/month for several GB I think.

Their webmail interface is bad, but then again, I've never seen one that isn't. And I've never used it after logging in for the first time anyway.

> Is it possible to host your own email server on a NAS or RPi something?

It's possible, but I wouldn't recommend it for something as critical as email. It's not that the actual hosting is hard, it's that more and more of the big providers are refusing to handle email messages from certain networks.