If you use a portal service, like Updox, you can send out blast texts, which I believe is offered as part of their premium service, or a Patient Broadcast and it will send everyone with a registered portal account whatever message you like. We did this a couple of years ago when we were going to be closed for 2 weeks for vacation, to mixed responses. I sometimes get alerts, even as recently as this morning, that a patient has opened the message. The only drawback is that there wasn't a way to send it to patients that were only seen within a certain span of time, it goes ALLLLL the way back to when you started your portal service. This caused a little bit of annoyance to inactive patients, who then asked why we were messaging them. But it reached a lot of people, just not anyone without a portal account.