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What can I mail through the Add-in?

You can currently mail these products through the Add-in: 

US Letter (8.5" x 11") or A4 

US Legal 8.5" x 14" 

Certified Mail: (Letter/A4)

Certified Self Mailer (Letter/A4)

 USPS Priority (Letter/A4)

Priority Express (Letter/A4)