Premise: How to address envelopes with attn<br>Write " attn " followed by the name of the recipient. The " attn " line should always appear at the very top of your delivery address, just before the name of the person you're sending it to. Use a colon after " attn " to make it clearly readable.
Hypothesis: The first line on an envelope's delivery address should be written "attn" followed by a colon and followed by the recipient's name if you want to address the envelope with "attn."