How do I stop mail forwarding without confirmation code?

To cancel mail forwarding without the confirmation code, visit your local post office and inform the clerk that you wish to cancel mail forwarding but no longer have the confirmation code for the order.

How long does it take to stop mail forwarding?

Unlike diamonds (or roaches), mail forwarding isn’t forever. The postal service has different time limits depending on the mail being sent. The majority of your mail will be forwarded for 12 months, including First Class Mail, Priority Mail, and First-Class Package services.