Consumer messaging of our URL is being blocked

Unfortunately no, it's not related to SSL. We use https exclusively. Our company doesn't even use SMS messaging, however we have a (very popular) referral program such that our customers share their referral links (which run on our domain) via SMS and other means. It's ironic, customers are so excited about our offerings that they share a lot and T-Mobile subsequently blocks the messages because they see what they deem to be too much volume of person to person texts that include our domain. We've been told by the T-Mobile tech department to ask our complaining customers to contact T-Mobile to complain as well. We do that, but ultimately a lot of our customers end up just switching cellular networks (it's that frustrating to them). There needs to be a better way.