I use Sendy, it costs a license fee (one-off) and then AWS fees which amount to a few dollars a month for my 5k sub list. Of course it means you need to setup

I use Sendy, it costs a license fee (one-off) and then AWS fees which amount to a few dollars a month for my 5k sub list. Of course it means you need to setup Sendy. I was going to setup as Sendy as a Service business, but most of the money would be paying license costs for software I could easily build with enough time, so I canned the idea and focussed on other projects.