This is the lesson where the pipeline system pays off. You have context no cold email from a list could have — you know they were on your site, what they were looking at, and roughly how interested they are. The email you write should use that context without revealing the surveillance.
Map what they viewed to the angle of your email:
The best subject lines for visitor intelligence outreach are 4–7 words, reference something specific about the prospect's company or context, and feel like internal correspondence. Avoid: "Quick question," "Following up," "Hope this finds you well." These are spam signals.
Better: "[Company] + [Your Company]" / "[Specific topic they'd care about]" / "[Mutual customer or competitor they'd recognize]"
Line 1: Reference their context without revealing the visit. Line 2: One relevant outcome/result. Line 3: Soft CTA. Total: under 80 words. No HTML formatting, no images, no unsubscribe footers on the first touch.