US Patent 11552915 Message sending method, device, and system

The present disclosure provides example message forwarding methods, devices, and systems. In one example method, a message server adds a first attribute tag for some group members in a group. Based on the first attribute tag, the message server creates a first subgroup consisting of the some group members. The message server receives a subgroup message including the first attribute tag, and the message server determines the first subgroup based on the first attribute tag. The message server then forwards the subgroup message to the determined first subgroup.