If USPS postal rates change, you can print a postage correction stamp which can be used with an already printed stamp to add additional postage. The postage value printed is as-is and is not a USPS Forever Stamp. SendPro keeps track of how many stamps you print with each serial number, so you do not have to use the entire sheet at once. Older sheets with 25 stamps (SL-SPM01) have serial numbers that start with "A", and newer sheets with 20 stamps (SL-SPM11) have serial numbers that start with a character other than "A". Each stamp sheet has a unique serial number and contains either 20 or 25 blank stamp stickers.
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