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Automated Rates

The Postal Service gives discounts to those who automate their mailings. To qualify for such savings, the Post Office does have certain requirements. While many of these requirements will be handled by us (sorting documentation by PAVE certified software, CASS certification of barcodes, and bar coded tray or sack tags), there are some things that businesses should be aware of before designing their mail piece.

Postal Specifications Chart

MIN

MAX

First Class Post Cards

Height

3.5"

4.25"

Length

5"

6"

Thickness

.007"

.016"

Letters (all classes)

Height

3.5"

6.125"

Length

5"

11.5"

Thickness

.009"

.25"

Automation Compatible Flat - Size Mail

Height

6"

12"

Length

6"

15"

Thickness

.009"

.75"

Quick Tips:
Mail length is the dimension that parallels the lines of the delivery address
Rectangular shape, with a height-to-length ration of between 1.3 and 2.5.
100% of the mailing must be delivery point bar-coded to qualify for automated rates.
Flats can be either zip + 4 bar-coded or delivery point bar-coded.
Minimum thickness for letters measuring 4.24" x 6" or less is .007

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