I also just recently switched to purelymail.com after hosting my own for several years via Mailcow and a cheap VPS. The cheap VPS was more expensive than the $10/year for Purelymail and I was only using it for mail anyway. Nothing to maintain now and so far very happy with how easy it was to move everything over.
Also, they don’t charge extra for additional domains so if you have multiple it’s still $10. Only been with them a few weeks so can’t say much yet for long term, but great so far!