How to Write the Perfect Subject Line [Infographic]

I’m going to go ahead and admit that there’s really no such thing as the perfect subject line—or, if there is, it must be hiding with Bigfoot and the Loch Ness Monster. After running subject lines through A/B split tests every month in our own newsletter, we’ve yet to find the secret formula (or even a statistically significant result). Alas, we’re not out to mislead you but rather guide you toward perfection. Here’s our tips on how to write the perfect subject line.