According to MailerMailer, emails with subject lines shorter than 35 characters were opened more than emails with subject lines longer than 35 characters. This data is based on aggregate statistics from over 300 million email messages sent by a sampling of over 3,000 permission based email senders. So, the best rule of thumb is to make the subject lines short and sweet rather than to make them large. But, it should not be very short also, like “Please see this”. These kind of short subject lines are often confused with spam. So how much is exactly 35 characters. For example, you want to use: “What is the ideal size of the subject line of the newsletter?” as the subject line of your newsletter. This has 61 characters. Now, we have to cut short. So the ideal newsletter Title would be: “Ideal size of newsletter subject line”. Now this has 37 characters. It is close to 35 now. There’s one more thing to make sure that we don’t have to make it so short that it looses its meaning in the process. So, the ideal subject line would be something less than or close to 35 characters.
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