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Test your email subject lines for spam triggers, deliverability, and open rate potential. Get instant feedback and suggestions.
47% of email recipients open emails based on the subject line alone. A great subject line can dramatically improve your open rates, while a poor one can land you in spam.
30-50 characters for best mobile display. 6-10 words optimal.
Using recipient's name can increase open rates by 26%.
Words like "free", "urgent", "winner" trigger spam filters.
Questions and incomplete thoughts drive opens.