Kimberly Hampton reports:
"Using the attention line correctly when addressing an envelope is more than good [business writing] etiquette. It helps guarantee that your mail is delivered to your intended recipient. Write the 'attention' line first. This is written with the abbreviation ATTN. Note that there is no punctuation mark with the abbreviation. The attention line always precedes the name of the company...Write the name of the company or organization where your recipient is located...Write the street address, including any suite numbers, on the next line...The last line of the address should be the city, state and ZIP code...The U.S. Postal Service requests that addresses are written entirely in uppercase with no punctuation."
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