irradiation by usps,shipping

Hello, thank you for reaching out to us with your important question. The U.S. Postal Service has announced that it is irradiating certain types of mail, specifically those with postage stamps addressed to specific government offices within the zip codes 20200 through 20599. This includes first-class business and letter-size envelopes, flats, express, and priority mail, as well as other packages. However, mail with postage meter strips and mail that is insured, registered, or certified is not subject to irradiation. Currently, all mail directed to the White House, Congress, and the Library of Congress undergoes this process. Signs of irradiation may include weakened or discolored (yellowed) envelopes, visibility of adhesive through the paper, and ink transfer. We hope this information is helpful to you. If you have any further questions, please feel free to reach out.