As of August 1st, 2017, the USPS has implemented a new Automated Package Verification system (APV, for short). APV means the USPS will verify that all shipments match the details on the label, including:
Origin Zip Code
Destination Zip Code
In the past, improperly-applied specifications would result in a shipment being returned, or in some cases, delivery charges would be tacked on for the recipient to pay. With APV, the USPS will deliver the package but will issue cost adjustments back to your postal account balance. These adjustments apply to both overcharged and undercharged shipments, making for a much more seamless shipping process with the USPS. The goal here is to make sure that all shipments are delivered on time.
APV can apply to any domestic package shipped using USPS or a USPS postage provider. (APV excludes letters, large envelopes, certified mail, and any/all international shipments.)
If you wish to dispute an APV adjustment, you will need to email USPS directly. They have an email address specifically for this purpose: VerifyPostageHelp@usps.gov
When emailing the Verify Postage Help department, include the following info:
The package's Tracking Number
The reason for disputing the adjustment (be as detailed as possible!)
To get the Adjustment ID for Stamps.com shipments, you will need to log in directly to your Stamps.com account and follow the steps outlined on the Stamps.com APV help page.
To get the Adjustment ID for other USPS postage provider, please contact the postage provider directly for information on gathering Adjustment IDs.
If the USPS requests more info, they'll reach out via email. Once a decision is made on the status of your dispute, they'll reach out to you via a forwarded email.