Abstract: A method, an apparatus, and a system for automatically replying a mail are provided. The method includes: receiving a new mail sent to a user; obtaining presence information of the user; searching for a mail automatic reply message corresponding to the presence information of the user; and sending the corresponding mail automatic reply message to a sender of the mail. Through the method, the apparatus, and the system, the presence information of the user is obtained, and automatic reply messages are respectively set for different presence information, so that the automatic reply messages are associated with the presence information of the user, and when a state of the user changes, the automatic reply messages are not required to be reset, thereby providing convenience for the user.

Abstract: A method, an apparatus, and a system for automatically replying a mail are provided. The method includes: receiving a new mail sent to a user; obtaining presence information of the user; searching for a mail automatic reply message corresponding to the presence information of the user; and sending the corresponding mail automatic reply message to a sender of the mail. Through the method, the apparatus, and the system, the presence information of the user is obtained, and automatic reply messages are respectively set for different presence information, so that the automatic reply messages are associated with the presence information of the user, and when a state of the user changes, the automatic reply messages are not required to be reset, thereby providing convenience for the user.

Abstract: A rifle including the firing mechanism of a revolver from which the revolver's original barrel and handgrips were removed. A replacement barrel, having a length greater than that of the original barrel, is affixed to the front of the firing mechanism as a substitute for the original barrel. A replacement stock for engaging a shoulder of a user is affixed to the rear of the firing mechanism as a substitute for the handgrips. A forearm is affixed to the bottom of the replacement barrel for steadying the rifle while aiming and firing. A method for converting the revolver into the rifle is also provided herein.