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Software for Mailing Software for Mailing

What is Mail.dat?

Mail.dat® is the industry standard data format for transferring information about a mailing's composition from one program to another. 

Window Book's DAT-MAIL™ program uses the Mail.dat data generated by many presort software systems and list brokers to simplify your:

  • Mail production
  • Mostage statement editing
  • Logistics and transportation planning
  • Mail acceptance and postage payment

Mail.dat is ultimately used by the United States Postal Service® (USPS) for electronic acceptance, verification and payment via the USPS PostalOne!® program, which DAT-MAIL supports.

A number of presort programs can generate Mail.dat files either as a standard capability or as an option.

* Mail.dat is a registered trademark of the International Digital Enterprise Alliance (IDEAlliance). Separate fees apply.

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