Remember when I said a lot of your email recipients will scan your email without reading all the copy? That's why you want to have a clear call-to-action (CTA) button that's easy to spot for even the quickest of email scanners. Without a CTA button, you won't be calling on your recipients to take any action that actually benefits them -- and the growth of your business.
When it comes to deciding how to craft that perfect subject line, there appears to be really only one area to avoid: the subject line of 60 to 70 characters. Marketers refer to this as the “dead zone” of subject length. According to research by Adestra, which tracked over 900 million emails for its report, there is no increase in either open rate or clickthroughs at this 60-to-70 character length of subject line.