Message processing method and system, and server

The invention provides a message processing method and system, and a server. The message processing method comprises the following steps: after a message sent to a second user by a first terminal of a first user is received, sending the message to a user terminal of the second user; when the second terminal of the first user is in the login state, sending the message to the second terminal of the first user; after first read indication information sent by a user terminal of a second user is received, generating second read indication information associated with a second terminal of the first user and third read indication information associated with a first terminal of the first user; sending the second read indication information to a second terminal of the first user, so that the second terminal of the first user deletes the message; and under the condition that the first terminal of the first user is in the login state, sending the third read indication information to the first terminal of the first user,