USPS Marketing Mail (PS Form 3602-R) Package Services (PS Form 3605-R) Periodicals (PS Form 3541) International Mail (PS Form 3700) If you have any questions, please reach out to one of the options below: Mailing & Shipping Solutions Center (MSSC) at 1-877-672-0007 Email MSSC@usps...
Postal Explorer The Postal Service is reminding customers that metallic mercury and devices containing metallic mercury are always prohibited in the mail stream. This includes antique items such as thermometers, barometers, blood pressure monitors and similar devices. ...