Designing a new mailer? We can help!

Many people don’t realize it, but there are some pretty useful guidelines available to ensure your mail not only looks good, but is easily metered and mailed. Below are some helpful guides to designing your mail pieces most efficiently.


General Guidelines

Folded Self-Mailers:

A folded self-mailer must be prepared with the folded edge parallel to the longest dimension AND the address of the mail piece. The mailing panel must consist of only the address, return address and the imprint or postage. Avoid lines and artwork that may interfere with the automated mailing machines. The post office requests that these mailers be secured with tabs, not tape.

Fonts and Graphics:

Any picture that distracts from the recipient’s address, or font styles that are fancy or fun might cause the post office’s automated machines to mis-read addresses, sometimes returning them to sender. Please use black ink, a font such as Arial or Times New Roman and keep graphics near addresses to a minimum.

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Postcards are an inexpensive way to get an immediate message to customers. To meet requirements it must be:

  • Rectangular
  • At least 3-1/2 inches high x 5 inches long x 0.007 inch thick
  • No more than 4-1/4 inches high x 6 inches long x 0.016 inches thick
  • For a detailed printout, click here!


To be eligible for mailing at the price for letters, a piece must be:

  • Have minimum dimensions of 3-1/2 inches high x 5 inches long x 0.007 inch thick
  • Be no more than 6-1/8 inches high x 11- 1/2 inches long x 1/4 inch thick
  • For a detailed printout click here!


The Postal Service uses the words “flats” to refer to large envelopes, newsletters, and magazines. The words are interchangeable. Whatever you call them, flats must:

  • Have one dimension that is greater than 6-1/8 inches high OR 11-½ inches long OR ¼ inch thick.
  • Be no more than 12 inches high x 15 inches long x ¾ inch thick.
  • For a detailed printout click here!


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