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When you need to verify that you’ve sent a
letter or package - purchase a Certificate of Mailing.
A Certificate of Mailing is a receipt that provides
evidence of the date that your mail was presented to the Postal
Service™ for mailing. It can only be purchased at the time of mailing.
And don’t lose it! It’s the only official record available. "
If
you use the "click and ship" service you add this by
clicking "add extra services". The price for this service
is $1.10. I've never used this feature myself.
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