Engaging. Compelling. Arresting. Even disturbing. These are words used to describe the control-beating packages created by direct mail writers and designers who are worth their weight in first class stamps. For those of you who aren’t direct mail writers or designers, you may not realize the range of response-influencing decisions that go into creating effective envelopes — outer and reply envelopes. If you’re an approving manager or someone who gives creative input, you need to understand how envelope copy and design work together to get mail pieces opened.