Boomerang analyzed 250K emails and found these TOP 3 insights:
1. Emails with spelling errors in the topic subject line received a 14% lower reply rate.
2. Emails between 50 and 125 words have the best response rate: 50%
3. Emails written at a 3rd grade reading level get the highest response rate: 53%
4. Three or four words are ideal for email subject lines.
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