Clients → Campaigns sends a branded email to a segment of your base, everyone, active contracts, customers who are going quiet, or customers you've not worked for in 60+ days, with live counts as you pick.
Going quiet is the early warning. Every night SwardOps looks at each customer's usual visit rhythm (say, every 14 days for the past year) and flags anyone whose gap has stretched to nearly double with nothing booked, as long as it isn't a seasonal pause (same time last year was quiet too). They show on the dashboard and at the top of Clients → Customers, with any overdue invoice or recent cancellation alongside, and there's a Monday nudge. That's the week to ring them; the 60-day segment is for the ones you've already lost.
Write it in plain text, add photos or a video, send a test to yourself, then go. Every send honours per-customer opt-outs and carries an unsubscribe link automatically (that's your PECR compliance handled), and each campaign is logged per customer in the Inbox thread.
Competitors charge real money for this. It's included.