Mailing Standards
By designing your mail pieces to Postal Service standards
your mailing can qualify for more and greater
discounts.
Some basic standards:
- First Class Postcards - minimum size is 3 1/2" high by 5" long and .007" thick; maximum size is 4 1/4" high by 6" long and .016" thick
- Letters - minimum size is 3 1/2" high by 5" long and .007" thick; maximum size is 6 1/8" high by 11 1/2" long and .25" thick.
- Flats - must be rectangular but NOT square and meet the following size requirements:
- Height - minimum 5"; maximum 12"
- Length - minimum 6"; maximum 15"
- Thickness - minimum .009"; maximum 3/4"
- Note - These are only general size and thickness requirements. Please check with our mailing specialists for exceptions and special rules for your mailing.
- Tabbing - to receive the lowest rates from the Postal Service, selfmailers
(small booklets and other folded items) require one or more
"tabs" on the open edge to prevent their jamming in Postal Service
equipment. Placement is determined by the size and type of mailing.
- Indicia - the indicia is the equivalent of a postage stamp and includes
the type of mailing, postal permit number and post office that issued the permit.