Earlier quoted context omitted.
I have this same problem with "obscure" .net domains. My text messages are silently dropped. The only work around I found is to not include http:// , just use the bare domain. Personally, I find this behavior of my SMS provider reprehensible.
I ran into this recently even on Facebook Messenger. A friend of mine was hunting for a short domain name and I had a list of some three character .net and .org domains I recently had found that were available. Cut and pasted the list and the message wouldn't send. Narrowed it down to one. Typed just the bare domain. Wouldn't go through. (It was something incredibly benign like n17.org) Couldn't find a history on tha…
A true hacker would have used binary search ;)