Electronic mail and Mail drop

Electronic mail noun - (computer science) a system of world-wide electronic communication in which a computer user can compose a message at one terminal that can be regenerated at the recipient's terminal when the recipient logs in.

Mail drop and electronic mail are semantically related. In some cases you can use "Mail drop" instead a noun phrase "Electronic mail".

Electronic mail and mail drop are semantically related. Sometimes you can use "Electronic mail" instead a noun phrase "Mail drop".