The ideal email subject line length

"In B2B emails, longer subject lines work better than shorter subject lines. Subject lines with 6 – 10 words will drive open rates, but don’t deliver the click throughs. After 130 characters, there is a drop of the open rates, but also a huge increase in the number of click throughs. Anything over 16 words can deliver on both opens and clicks.

In B2C emails, subject lines with 3-5 words appear to have a very bad effect on open and click through rates. Subject lines with 3 or 4 words preform around 40% worse than average both in open rate and in clicks. The subject lines with over 80 characters do hugely better."

Comes from a marketing perspective, but might apply to person to person email. I always thought shorter titles were much better, apparently I was wrong.


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