First-Class Mail includes those letters and letter packages (i.e., "letter mail") which satisfy the following basic criteria:

Mail closed or otherwise sealed against postal inspection;
Handwritten or typewritten communications having the character of current and personal correspondence;
Matter having the character of actual and personal correspondence; and,
Bills & statements of account.

Unless prohibited by the destination country, merchandise and printed matter conforming to the applicable weight and size limits also may be mailed at letter rates. Letter mail must be enclosed in an envelope or wrapper.

Any matter eligible for mailing may, at the option of the mailer, be mailed as First-Class Mail.

Description of Service

Use First-Class Mail for sending letters, postcards, postal cards, greeting cards, personal notes, checks, and money orders.

Additional services such as certificates of mailing, registered, and restricted delivery can be purchased for First-Class Mail. Insurance can also be purchased. However, insured articles mailed at the First-Class rate must contain only merchandise or material not required to be sent as First-Class Mail.

All First-Class Mail receives prompt handling and transportation. First-Class Mail is generally delivered within 2 days to locally designated addresses. Delivery by the third day can be expected for remaining outlying areas.