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Email Subject Lines Research

All marketers know how hard is it to write great copy and put together an interesting email. Many great email contents fall short because they have poor subject lines. The subject should encourage subscribers to read your messages.

Is there a great mystery to the perfect subject line length?


Yes, length of subject line in email depends on many factors. We will try to determine a few of them.

  • Lately more emails are opened on mobile devices. Number of characters could well be influenced by devices and browsers which you audience uses. Monitoring your clients devices is worth doing. Tools like Campaign Monitor, in the Campaign Reports section under Email Client Usage are very helpful.
  • Also it is a very good idea to do some testing which of the email subject lines have higher open rates in the emails you send in the past.
  • Return Path suggest that 61-70 characters in subject lines tend to gets the best results at the moment.
  • Also, it is important to be creative with subjects. Always use different email subject lines, be personal (use clients names), always A/B test subject lines.


Email subject lines are very important. They should encourage subscribers to open an email and take relevant action. Length of the email subject will vary and only regular testing will help you to achieve perfect subject line length for your business.

There are also some important dont’s when it comes to subject line writing, in order to avoid getting on the dreaded blacklist. You will need to look around as there is no comprehensive list, but your spam folder can give a good idea.

Blacklisting occurs for many other reasons besides the words you use, like having an unsubscribe option, and clearing out your send list often to keep it clean.

If you need any help with increasing your digital activities or more tips on Emails or on how to make more opportunities for your business, then please get in contact with us here at Network Intellect.Telephone: +44 (0) 844 543 0980

 Please get in contact with us here at Network Intellect


This article was posted by Email Subject Lines Research

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