That's a bit of shrinkflation. I always wanted to use it, but for some reason they only supported GoDaddy domains which I definitely do not want. I guess it is Apple for me now.
I decided I wanted to use M365 and the domain to use it with simultaneously, so GoDaddy was the path of least resistance. I'd have avoided them if I realized it could be avoided.
Later I found out that the URL they used to forward you to GoDaddy's website happened to include the content of the records needed in DNS. Others were successful with other DNS providers. You just clicked the link, added the DNS records from the link manually, and eventually it'd validate.
I use the Zoho free plan for up to five email addresses (not counting group aliases) on several domains for maybe four years now. works great for basic email!
I pay for FastMail (out of UI preference) but was with Zoho for a while and don't have a bad word to say about them. Especially for free, but even if they weren't.
