According to their April 1st committee finance report, they've been making a lot of payments to eztexting.com for their "mass texts to supporters expense" and eztexting claims to have a "SafeSTOP" compliance so you could try reporting SAN to them. Source: about 3 years ago

Also, an alternative would be Textable. We offer plans starting at $5/mo that provides a user interface both on web and mobile for utilizing their API with your existing numbers. You can see more details at https://textable.co (Disclaimer: I work here). Source: about 1 year ago

I can’t offer much on the 3CX side as they’ve alienated us out of being customers, but, if you’re looking for a more robust messaging solution, you can check out our app, Textable. (https://textable.co) disclaimer: I work here. Source: about 1 year ago

Hey, check out https://textable.co (I work there). It sits alongside your voice product and uses your own carrier connection and has more advanced messaging features than 3CX (and most other PBX). I think our "Blasts" feature is what you're looking for. Source: about 1 year ago

Sure, I thought that would link but it doesn't seem to be. https://textable.co we've got plans starting at $5/mo for the most "basic" messaging. It comes with some extra features like away messages and canned responses. There's a $30/mo plan that has a bunch of marketing features (meant for business). Source: about 1 year ago