Clients → Campaigns sends a branded email to a segment of your base — everyone, active contracts, or customers you've not worked for in 60+ days — with live counts as you pick.
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.