Using time-sensitive subject lines is a go-to tactic for online retailers. But the formula for success may not be as simple as you think.
Take a look at this subject line test:
Subject line A:
Last chance to order for Valentine’s Day is this Wednesday, Order Now
Subject line B:
Only 48 hours to order for guaranteed Valentine’s Day delivery
Industry standards would suggest that subject line B would win: It uses a numeral and is shorter. But subject line A yielded 23% more sales.
Why do you think A beat B? Email your thoughts to