A method for realizing one account with multiple user names includes: 1, setting up and keeping an image relation for an account label with multiple user names, in which each user name corresponds to a postbox address and said postbox server assigns corresponding storage space of a box based on the account label, 2, when the server receives an E-mail, it finds out the account label corresponding to the address of the box based on step 1 to store the E-mail in the space corresponding to the label.