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How to address envelopes with attn 
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.
This line signifies to the mail carrier exactly for whom the letter is intended. For example, write " attn: john smith, " where " john smith " is replaced with your recipient's name.