I have been using Purelymail since July 2021 and it's worked very well for me so far. You can have as many domains and accounts as you want and the pricing come

I have been using Purelymail since July 2021 and it's worked very well for me so far. You can have as many domains and accounts as you want and the pricing comes down to total usage. For me it's been $0.40 per month.