[header] How to address envelopes with attn [title] Write " attn " followed by the name of the recipient. [step] 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. 
This line signifies to the mail carrier exactly for whom the letter is intended. [substeps] For example, write " attn: john smith, " where " john smith " is replaced with your recipient's name.