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 proper formatting for a delivery address includes "attn" followed by a colon then followed by the name of the envelope's recipient.