Concepts and technologies are disclosed herein for verifying sender information. According to various embodiments of the concepts and technologies disclosed herein, a verification service can determine, receive a request, or receive a call to verify sender information associated with data. The server computer generates and delivers a verification message to a sender device in response to determining that sender information verification is to be provided. The server computer receives a response indicating if the data was sent by the sender device. If the response indicates that the sender device did not send the data, the server computer can block delivery of the data, generate alarms or alerts, take other actions, and/or take no action. If the response indicates that the sender device sent the data, the server computer can deliver the data, provide a verification response to the recipient device, take no action, and/or take other actions.