https://mxroute.com/ is what I use for this very purpose and so far I'm very pleased with it.
I'm slightly bothered by the fact that their servers are located in the worlds surveillance hotspots no. 2 and 3. but i guess email always has at least 2 involved parties, so it's not exactly "top secret".
I used to run my own mail server for years but spam was becomming a problem as it always does when running your own system and I thought the pricing of most of the services was poor if you had lots of addresses but didn't send/receive many emails. Spam hasn't been an issue for me with mxroute so far and their infrastructure seems to be pretty solid.