[laundermaf]

One of many, existed since at least 2013. The most popular one went bust since it was free and many more were born, bought and died since.

It’s good to keep seeing alternatives though since the lifespan of such services isn’t very long.

I myself ended up making my own version on AWS Lambda and SES and that worked well for 7 years without a change. This pattern is so common I think an example lives on AWS’ own help site.