Why it works
Past clients are your warmest source of repeat work and referrals, and they forget you the moment a project ends. A no-agenda "how are you?" every six months keeps the relationship warm — and the replies often surface new work without you ever having to pitch.
Make it yours
Keep it genuinely agenda-free; the moment it reads like a sales email, it loses its power. Segment by client type if you want different cadences for different relationships.