Abstract: A system and method for providing an auto-reply message in response to an incoming message sent from a message sending device and delivered by a unified messaging service as an email encoded with information about the sending device's type and address. The incoming messages may be coming from email, fax, phone, text message, instant message, MMS, TV, or other communication devices. The auto-reply function of this invention is capable of replying to the messages regardless of what type of message sending device is used. The system is preferably implemented by integrating the new technologies of unified messaging service and unified message delivery service with the email tool, and by employing the new design methodology of cloud computing.