Finally got it working– for others I needed to add a couple of lines to the web config to allow XML to be posted. Check out
https://msdn.microsoft.com/en-us/library/hh882339%28v=vs.110%29.aspx
I think that it was just smoke from the Verizon sales person but I wanted to check a few sources. Blacklisting in the email world is where x amount of people complain. Is it like that in the text world? The reason I ask is that our texting is only going to be to people who opt-in so I don’t believe we will be crossing any lines. Thanks for your information.