I may have a brain the size of a peanut, but when you've around for 230 million years you pick up a thing or two.
Lasting relationships need to be carefully nurtured over time, allowing the development of trust and abiding affection. This is as true for marketing as it is for romance.
You should hopefully be familiar with the concept of list segmentation and the reasoning behind it. Sending tailored campaigns to specific subsets of your subscribers will allow you to create more persuasive emails.