Email list growth is easier to act on when a new subscriber receives a prompt at the same moment they join. Join By Text lets people sign up from their phones by subscribing to a keyword with their email address. Through Zapier, Mobile Message can send a confirmation text or record the person as a contact.

New Subscriber is the available trigger. It can start a Mobile Message SMS that welcomes the subscriber, explains what happens next or confirms the list they joined. You can also use Create Contact to place the subscriber’s details into Mobile Message, or Add Contact to List when you want them assigned to a particular messaging audience.

This gives your team a practical follow-up point without manually transferring each new sign-up. The Zap uses the subscriber information supplied by Join By Text and runs in one direction. It does not represent a two-way list sync. Consider making the message clear about what the subscriber has joined and include a straightforward way to manage future preferences where appropriate.