A safe bit
If you want to achieve a higher response rate with your mailings than before, then this is easier than you think. The most promising method is to stimulate your addressee’s curiosity. And what arouses people’s curiosity more than anything else? Locked doors or chests that hide a secret – there every adult becomes an expectant child again. If he’s then given a key to open the lock, he’ll hardly be able to contain himself. He wants to know if his key fits to hold the hidden treasure in his hands – before someone else gets it.