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Resources & Links
| Postal Explorer |  | This is Postal Explorer, the Post Office's how-to site. You'll find Quick Service Guides, reply envelope templates, zip code look-up and more here.
The Quick Services Guides have decision guides to aid in the mail planning process and a two page "condensed" version of requirements for each class of mail. Also, rate calulators for US and international mail can be found here.
http://pe.usps.gov
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