Cold Email
2026-09-28 · 5 min read
Your cold email subject line determines whether the email is opened or deleted. These 30 subject lines are drawn from real B2B campaigns, categorized by psychological trigger.
Four psychological triggers drive cold email opens: curiosity, relevance, urgency, and social proof. The best subject lines combine two of these.
"Quick question about [Company]" / "Had an idea for [Company]" / "Noticed something on [Company]'s website" / "Not sure if this is relevant for you" / "This might be a long shot" / "Something that helped [similar company]" / "Does [Company] deal with this problem?"
"[City]-based [category] and lead generation" / "Other [industry] businesses in [City] are doing this" / "[Specific pain point] for [category] businesses" / "Lead gen for [industry] — worth 10 minutes?" / "[Their niche] + automated outreach"
"Intro" (one word) / "Following up" / "Tried calling earlier" / "2 minutes?" / "Worth a quick chat?" / "[First name] — quick ask" / "Is this a priority for [Company] right now?" / "Did I lose you?"
"Are you interested in growing your business?" (too generic), "I can help you 10x your revenue" (overused), "Free trial available now!" (screams marketing), anything with CAPS or multiple exclamation marks.
Split your list: 50 contacts get variant A, 50 get variant B, same send time, same body. Measure open rates after 72 hours. The winner becomes the control; test the next variant against it.
Under 8 words. The sweet spot is 4–7 words — short enough to read in one glance, specific enough to feel relevant.