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You use Certificate of Mailing with:
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First-Class Mail® – Letters, envelopes, and small packages weighing 13 ounces or less. |
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Standard Mail - Items weighing less than 16 ounces can be sent at discounted presorted and automation rates. |
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Package Services - Send small and large packages, envelopes, and tubes. includes Parcel Post®, Media Mail, Bound Printed Matter (paid by permit imprint only), and Library Mail. |
You can combine Certificate of Mailing with the following Extra Services:
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