Large mailers will presumably have the expertise to avoid the surcharge, which took effect yesterday, by complying with Move Update — though a PostCom podcast indicates that even sophisticated mailers may unwittingly run afoul of the new regulations. (The USPS also has a website explaining Move Update.)
A Bad Move for Small Mailers: Postal Expert Questions Move Update Surcharge
Large mailers will presumably have the expertise to avoid the surcharge, which took effect yesterday, by complying with Move Update — though a PostCom podcast indicates that even sophisticated mailers may unwittingly run afoul of the new regulations. (The USPS also has a website explaining Move Update.)