My phone number was put on a spam list by the InterCarrier organization that is composed of the different carriers (Verizon, AT&T, etc), without my knowledge

Suddenly people were not receiving my texts, even though it would appear to me that they were sent. I had no idea why this was happening. It took technical support a month to v figure out the problem. During that time anyone who did not use the same career as me did not receive me SMS messages. (But they did receive MMS messages)

This was very distressing & confusing. To save other people from going through this same problem, Textra should create a warning when someone tries to send a message to a large group.