Until this year, I underestimated how much of an impact valentine's day subject lines can have on my email campaigns. I used to think a good offer was enough, but after testing different subject lines, I've seen firsthand how much of a difference an open rate can make. An easy transition from “Last minute gifts” to “Uh-oh! Forgot your Valentine's Day gift?” made a difference. It wasn't just about sounding catchy, it was about touching an emotional wave. People are busy, distracted and inundated with promotional offers - if you don't grab their attention right away, you're done. Lesson learned: the subject line isn't just a preview, it's the key to the success of your entire campaign.