1. 33% of email recipients open email based on subject line alone. [Source: Convince&Convert]
2. 69% of email recipients report email as based solely on the subject line. [Source: Convince&Convert]
3. 40% of emails are opened on mobile first – where the average mobile screen can only fit 4-7 words max. [Source: ContactMonkey]
4. Emails with “You” in the subject line were opened 5% less than those without. [Source: Sidekick]
5. Emails with “Free” in the subject line were opened 10% more than those without. [Source:Sidekick]
6. Emails with "Quick" in the subject line were opened 17% less than those without. [Source:Sidekick]
7. Emails with "Tomorrow" in the subject line were opened 10% more than those without. [Source:Sidekick]
8. Emails with "Meeting" in the subject line were opened 7% less than those without. [Source:Sidekick]
9. Emails with no subject all together were opened 8% more than those with a subject line. [Source: Sidekick]
10. Emails with “fw:” in the subject line were opened 17% less than those without. [Source: Convince&Convert]
11. 18.7% decrease in open rates when the word “newsletter” is used in subject lines. [Source: Adestra]
12. 61.8% increase in opens when using the word “alert” in subject lines. [Source:Adestra]
13. Using the words “Sale,” “New,” or “Video” in subject lines boost open rates. [Source: Adestra]
14. Using “Daily” or “Weekly” in subject lines boosts open rates whereas “Monthly” hurts them. [Source: Adestra]
15. The top five subject lines in a recent study all included “Re:”. [Source: ContactMonkey]
16. Subject lines with 30 or fewer characters have an above average open rate. [Source: Adestra]
17. Subject lines with 3 or more words are opened 15% less than those with 1-2. [Source: ContactMonkey]
18. Personalized subject lines are 22.2% more likely to be opened.[Source:Adestra]
19. Subject lines that create a sense of urgency and exclusivity can give a 22% higher open rate. [Source: Email Institute]
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