1) Addressor 2) Bounce message recipient 3) Christmas card writer 4) Communicator 5) Correspondent 6) Dispatcher 7) Email info 8) Email origin 9) Fax originator 10) Fax user 11) Fedexer 12) Jewish boy name 13) Letter-writer 14) Mail party 15) Mailer 16) Messenger-service client 17) One going to the post office 1) Jammer 2) Mailer 3) Spammer 4) Transmitter 
A sender was a circuit in a 20th-century electromechanical telephone exchange which sent telephone numbers and other information to another exchange. In some American exchange designs, for example 1XB switch the same term was also used to refer to the circuit that received this information. The corresponding device in the British director telephon...
• (n.) One who sends.
a device that generates and transmits signals
Another name for agent.
Another name for agent.
A sensor unit conveying information about an engine to a gauge warning light, or other component.
Send'er noun One who sends. Shak. 
Sender is American slang for a person who arouses others emotionally.
[n] - someone who transmits a message
transmitter noun someone who transmits a message; `return to sender`
An electronic sensor unit on a motorcycle conveying information about an engine to a warning light o