USPS PostalOne! - File Validator

Prior to using the File Validator, ensure your computer has sufficient physical memory (RAM), based upon the size of the Mail.dat job.

Net Size of Mail.Dat Job (MB) *	Recommended Physical RAM
0 - 10	64 MB
11 - 25	128 MB
26 - 50	256 MB

* Net Size of a Mail.dat job is calculated as "total size of all files" associated with a job, minus the size of the PQT, SNR, and PDR files.

For More Information:

See the PostalOne! Mail.dat Guides
Review the PostalOne! Program requirements
Contact the PostalOne! Customer Care Center at (800) 522-9085

To use the File Validator:

Select the files you want to validate in the pane below .
Click the Validate Files button at the top of the right pane below.

Alternate Access
If you are unable to access the File Validator or Transfer tools, e-mail a Mail.dat job or a manifest file as a compressed WinZip file to: postalone@email.usps.gov. The subject field of the e-mail should include either “validation” or “insertion” to indicate whether the files should be validated or inserted in the PostalOne! database.

The PostalOne! Customer Care Center guarantees files will be processed within 48 hours of receipt. A confirmation e-mail will be sent once the files have been processed and will include the result. For submissions that contain validation errors, the validation log will be included as an attachment to the confirmation e-mail.