Used it for a company and noticed that documentation is almost non existing. After long waits getting instructions and get it running. Found out that there is buggy behavior and gmail is blocked. But even on production issue we need to wait days for a response which is often mediocre at best so we need to email again and again and again to get somewhere.

On our last emails (production issue) from a month or so ago there was not even one response anymore. emailed again and again, still no response.

Moved to Mailersend which is having a very robust solution, excellent documentation and chat based support.

If you want to build a successful company stay away from this offer.