USPS Frist Class Mail >Label>>Document Options>>>Label Branding
USPS currently prints Message #1,#2, #3 on First Class Parcel labels but the Messages do not print on First Class Mail Labels. I have been printing them on Teapplix for years and both platforms use the Stamps.com template. Shipstation support stated that this is not currently supported and suggested leaving feedback to add to future modifications. This is important to our business.