I am using sovereign - https://github.com/sovereign/sovereign https://github.com/sovereign/sovereign It is dated it seems, but still does a job. There are ind

I am using sovereign - https://github.com/sovereign/sovereign https://github.com/sovereign/sovereign It is dated it seems, but still does a job. There are indeed issues with delivery, but you just work through these as they arise. Also, there is no monetization involved, so I do not care that much about delivery rate. But if your profits are directly tied to delivery rate - hoting own SMTP server might not work as well.