Priority Mail Express: Anything mailable, letters, merchandise. Priority Mail:Anything mailable, bills, invoices, personal correspondence, merchandise. First-Class Mail: Anything mailable, bills, invoices, personal correspondence, merchandise. Periodicals: Newsletters, magazines; (formal authorization needed).
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Types of Mail · First Class Mail · Priority Mail · Express Mail · Parcel Post · Media Mail · Certified Mail · Registered Mail. Insured Mail; Courier Mail - ...
Several mailing services are available to fit your needs. Priority Mail Express®. Letters, large or thick envelopes, tubes, and packages containing mailable ...
Domestic Mail Classes · Express Mail · First Class Mail · Priority Mail · Bound Printed Matter · Parcel Post · Library Mail · Media Mail.