The best CTA copy for cold sales emails should be clear, concise, and action-oriented. Use straightforward phrases like "Schedule a quick call" or "Get your free trial today." Keep the length between 4 to 8 words for optimal engagement. It's effective to mirror the CTA in the email subject line, reinforcing that taking action is easy. Phrasing like "Let's connect this week" or "Unlock your discount now" can create urgency and encourage responses. Personalization is key, so tailor your CTAs to address specific pain points or interests of the recipient for better results.