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mail 
Everything sent and distributed through the postal service.
postcard 
Photograph or illustration that is printed on flexible cardboard and has space on the back to write a message and an address.
letter 
Written message that is inserted into an envelope and addressed to a recipient.
postage stamp 
Small adhesive label of varying denominations that is issued by a postal service and used to indicate postage paid.
bulk mail letter 
Mail consisting of a large number of letters mailed at the same time by the same sender, usually at a reduced postage rate.
postal parcel 
Parcel sent through the mail.
postal order 
A certificate issued by the postal service by which a sender is able to pay a specified sum to a recipient at another location.