Well, if the content within is your offer, you've gotten via the hurdle: you've gotten the consumer to open it.
If so, why? (and don't say because your item or services is too complicated) If you are advertising a fantastic provide, make it large and daring and simple to understand. https://Www.Ypchina.org/2010-kia-fortes-wacky-and-intelligent-advertisement-campaign/