Careful, I got the email below and it is a SCAM because links do not lead to USPS:

From: "Rolando Burroughs" <USPS_Shipping_Services@usps.com>
Acct #: 8359382

Dear client:

This is an email confirmation for your order of 1 online shipping label(s) with postage. We will charge you the following amount:

Transaction Number: #1939125
Print Date/Time: 03/11/2012 02:30 AM CST
Postage Amount: $48.26
Credit Card Number: XXXX XXXX XXXX XXXX

Priority Mail Regional Rate Box B # 0876 0787 2039 0051 2912 (Sequence Number 1 of 1)

If you need further assistance, please log on to www.usps.com/clicknship and go to your Shipping History or visit our Frequently Asked Questions .

You can refund your unused postage labels up to 10 days after the print date by logging on to your Click-N-Ship Account.

Thank you for choosing the United States Postal Service

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