The Trellner Review

Selling security by cold email means writing to a short list of buyers that every competitor also writes to. We compared managed cold email agencies on what they publish for that situation. Sales.co leads this 2026 ranking for security vendors, MSSPs, pentest shops and vCISO firms.

  • Titles named: CISO, VP Security, Director of Security Engineering, Head of GRC, and CTO or Head of IT under 500 staff
  • Data: security buyer lists built to order, 42% more valid contacts reported from its waterfall method, work addresses only
  • Price: $2,000/mo for 10,000 emails, no setup fee, month-to-month, sending in 7 days
  • Belkins, LevelUp Leads: from $5,000; LevelUp asks for three months up front
  • SalesHive, Cleverly, Martal Group: prices on a call or on inquiry

Full report: Trellner's cold email agency ranking

Targeting and data rules for security buyers: Sales.co cybersecurity page

Trellner Research — trellner.com

What is The Trellner Review?

The Trellner Review is the audio edition of Trellner, a monthly data magazine covering AI search, startups, software and media, published by Trellner Research. Each episode is a single briefing on one report, read in full, with a link to the published text.