Personally, I use Migadu[1] for sending and receiving mail with my own domain. I've yet to find anything that provides more bang for my buck.

[1] https://www.migadu.com/en/index.html

Thanks for this; pricing tiers based on outgoing email volume instead of number of domains or mailboxes is perfect for a lot of situations.

I second your recommendation of Migadu.

Earlier this year, I had to move a number of email accounts (my own, family, friends, clients).

Based on a fairly extensive comparison of email hosts - with brief stints trying self-hosting as well as Zoho - I migrated to Migadu and have been very happy with their service.

Their pricing is clear, structured well to suit my needs, and the service has been reliable.

Mailbox.org is fairly cheap (a few euros a month) and it supports custom domains. It also has some neat features like auto-encrypting all incoming emails to a given PGP key (while not perfect it makes all of your emails more private in storage and makes it harder for a compromise to result in past private information from being stolen -- though of course Mailbox.org could in theory just keep the original messages around). They're also based in Germany.

FastMail and ProtonMail both support external domains on their paid tiers.