Sender Email Marketing & SMS

I would use it, but I had a problem with installation, domain, and email confirmation; I had to contact support via email to do so (it took a few days)... Support asks basic questions such as "Did you check your Trash folder?" and disappears till the next day, etc. Main issue: Every morning, the app moves from Installed to Uninstalled by itself... Support couldn't help (maybe they can, but one email a day is not worse it)...

So, I'm moving to another better-developed app.