mail (usually for weight reasons in the form of a postcard) carrying the name of the sender by means of an unguided hydrogen- or helium-filled balloon.

mail delivered by bicycle and identified by stamp and/or postal mark.

plural of electronic mail

plural of mail slot

A person employed to deliver mail.

Hostile correspondence sent to an individual or group.

A special type of mail that provides more control than regular mail.

plural of mailing list

plural of voice mail

Mail which is transported by motor vehicle, by railway, or by seacraft, but not by aircraft.