For one thing, do not just chuck those envelopes. We’ve all opened our mailboxes to discover an unsolicited credit card offer (or three) inside. Although there must be people out there who take advantage of these offers, most of us simply throw the unopened envelopes in the trash. Yet simply tossing these pieces of snail mail can leave you and your finances vulnerable. Here’s why, and how you can get those unsolicited offers to stop for good.