The phrase "message sender" refers to the person or entity who is responsible for creating and sending a piece of information or communication to someone else. Full definition
SimplyFile also lets you file by message threads or by message sender. (slaw.ca)
Stars act as stamps for message senders: if the recipient's inbox is full Writing a great first email message is critical to success or failure in your dating life. (myintimcity.com)
It's reasonable for text message senders to assume the recipients will behave responsibly, and he also noted drivers are bombarded with many forms of distraction. (slaw.ca)