You have the option of mailing your 4x6, 6x9 and 6x11 postcards via USPS First Class Mail. You also have the option of mailing your 6x9 and 6x11 postcards USPS Standard Mail, but only within the US.
You have the option of mailing your 4x6, 6x9 and 6x11 postcards via USPS First Class Mail. You also have the option of mailing your 6x9 and 6x11 postcards USPS Standard Mail, but only within the US.