I may be late here, but if you’ve got an iPhone here is how I did it.
After you’ve set up your rule with your own phone number, trigger the rule, the number that sms texts you, you’ll save that number (door sensor) then you’ll head over to shortcuts then tap automations. Crest an automation that sends a text out to other contacts when you get a message from the number that you just saved.
Our Email-to-SMS wizard included in the latest beta enables you to enter your phone number and it will attempt to automatically find the email-to-SMS format for your carrier. This works for the big three US carriers mentioned above and has some fallback search features for a number of international carriers.
If your carrier isn’t automatically matched, but has an email-to-sms format, you can use it directly but we’d also love if you let us know the format so we can add it to the database!
I know this is old but I came across an app that works for me. I have sharptools doing the sms to me and I have it set up with an app called sms forwarder. For the app there’s a filter that if I receives a message from the sharptools number with a certain phrase it’ll be forwarded to a few people.
I have an app called sms forwarder that does it. I’ll know in a few hours if it actually works or not. The sms from sharptools comes to me then the app forwards it to a few people if my name is in the message.