I use this myself for forwarding emails and signing up for random sites. Pretty easy to set up and 0 overhead to maintain. One of these days I'll set up a ui around it to send emails. Having both set up and maintained an email server "the old fashioned way" and using this, the over head on this is way less than postfix et al. This only goes for receiving email though, sending email with this is a biiit clunky, and doesn't support attachments (yet). If you have an aws account and a spare domain give this project a shot! It has a surprising amount of utility.
If you only want forwarding, you could look at https://www.nearlyfreespeech.net/services/email . You'd have to do a bit of math to figure out the total price (depending on if you want/need DNS there to make it work), but it is _really_ cheap and easy.
