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Full Color Printing Design File Preparation Checklist

First Class Postage Requirements

When designing your mailing for printing, it is important to keep in mind what is required by the post office. Not all sizes are accepted and not all sizes are machinable. This page will list requirements and restrictions for mailings to be accepted as first class. Remember that length is considered to be the dimension parallel with the address and height is the dimension perpendicular to the address. Marsid M&M Group specializes in Design for Mailings.

First Class Post Card Requirements

  • Length: 5 inch minimum to 6 inch maximum
  • Height: 3.5 inch minimum to 4.25 inch maximum
  • Thickness: 0.007 inch minimum to 0.016 inch maximum
  • First Class Letter Requirements

  • Length: 5 inch minimum to 11.5 inch maximum
  • Height: 3.5 inch minumum to 6.125 inch maximum
  • Thickness: 0.007 inch minimum to 0.25" inch maximum
  • Additional: Letters that are non-machinable in one or more ways are subject to a $0.20 cent non-machinable surcharge
  • First Class Large Envelope Requirements

  • Length: 11.5 inch minimum to 15 inch maximum
  • Height: 6.125 inch minimum to 12 inch maximum
  • Thickness: 0.25 inch minimum to 0.75 inch maximum
  • Additional: Large envelopes that exceed one of these characteristics, are rigid, nonrectangular, or not uniformly thick pay package prices