General info
Mail Piece Colors
• Select white or pastel colors. These colors allow maximum contrast for
postal equipment address readability.
• Avoid recycled stock with flecks in it.
• Leave a blank "knock-out" of 4" wide x 2" tall for addressing on colorful
mail pieces.
Letter Size Dimensions
• A mail piece less than 5" wide x 3.5" high x .007" in thickness is
NOT MAILABLE.
• Aspect ratio is the length of mail piece divided by the height of the mail
piece. The total must equal a minimum of 1.3" up to a maximum of 2.5".
Failure to meet this requirement will result in additional postage charges.
• For a mailing with pieces larger than flat sized dimensions, please contact
Mail Preparations for consultation (mailprep@uw.edu).
Submitting Electronic Address Files
Excel file layout example:
Accepted file types:
•Excel Spreadsheet
•Text: Tab Delimited
•Text: Comma Delimited
Questions? Send information and/or questions regarding electronic address
files to the Mail Prep List Coordinator at addrfile@uw.edu.
Mail Piece Design 101
7
