Stamps.com experienced a minor incident on April 20, 2026 affecting Stamps.com Software (Printing Postage Using our Windows Application), lasting 18h 16m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Apr 20, 2026, 10:44 PM UTC
Stamps.com Engineers have identified an issue that may temporarily affect some of our customers' ability to rate and print UPS shipping labels through our classic Windows client application. We are working to quickly resolve this issue and will provide an update when it is available. We apologize for the inconvenience.
- resolved Apr 21, 2026, 05:00 PM UTC
Stamps.com Engineers have fixed the UPS postage rating and printing issues within the Windows client. We apologize for the inconvenience and thank you for your patience. If you are still having issues, please contact us.