AI Email Subject Line Creator

• 30-50 character subject. Mobile inbox truncates around 41 characters.
• Set a preheader. Second-most-important open factor after subject.
• Pattern interrupt. Lowercase “hey” subjects often outperform Title Case in B2B.
• Avoid spam triggers. No ALL CAPS, no !!!, no “FREE MONEY”, no “click here”.
• Personalize sparingly. First-name personalization works for cold outreach but feels canned in high-volume newsletters.
• A/B test. The best subject for your list is rarely the “best practice” subject. Test 2 variants per send.

For full-email AI drafting, see AI email response generator.