1. Keep the subject line to the point 

A report by Retention Science found that subject lines with 6 to 10 words deliver the highest open rate, making 8 words an ideal number for a subject line.

If a subject line is too long, it will get cut off and your reader will not know what the email is about (and could ignore it). Obviously, right?

And all the more, this is important for mobile readers as the subject line character length is even shorter - which is why more than 85% of subject lines are shorter than 90 characters!

2. Personalization is the key 

If the subject line is addressed to the recipient, subject lines personalized with a recipient’s first name, for example, can lift open rates by as much as 20%!

3. Add relevant keywords & avoiding misleading ones 

By analyzing billions of emails sent and opened, an expert was able to find out which keywords to use and which to avoid in the subject line.

Examples:

  • The most clicked-on emails had these words in the subject line: "secrets", "e-sales" and "awesome".
  • The emails reported as spam included the words "confirm", "features" and "upgrade".
  • It was observed that users are less likely to open emails that include a question mark (?) or a hashtag (#).

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