How to design a letter (or standard class postcard)
This class of mail must be within the following dimensions:
If the piece has an aspect ratio (length divide by height) of less than 1.3 or more than 2.5, it is non-machinable and will get a higher postage rate (e.g., square envelope has an aspect ratio of 1, making it non-machinable).
Placement of the address and the address barcode can also affect postage rates. Mailrite’s account managers can help you with any questions about mail piece design to get the best impact and postage rates. For more detailed instructions, visit the USPS Quick Service Guide 201a.
Contact us or call us toll-free at 1-800-437-7780.