New Activity is the one event worth building a Zap around, because it fires the moment a prospect replies, bounces or opens an email inside a lemlist campaign. On its own that reply sits in an inbox until someone checks it, which can be hours later if the day gets busy. Paired with Mobile Message through Zapier, that same reply can trigger a text out to the prospect straight away, so a warm lead hears from you while the conversation is still fresh in their mind. Unsubscribed Recipient works the same way in reverse, feeding straight into Mobile Message so the person is added to the unsubscribe list and never texted again.

The connection also runs the other direction. A reply sent in as SMS can trigger Add Lead to Campaign in lemlist, so a customer who texts back gets picked up as a lead without anyone copying details across by hand. Set up once inside Zapier, the two tools cover both channels, email outreach in lemlist and the text message that follows it up.