The invention relates to a method and a system for sending a message on the basis of an Internet protocol to an arbitrary call number of a recipient, wherein the recipient address is formed from the call number of the recipient and a domain addition, and the message is stored on a message server (4), particularly for further use and/or provision for the recipient. The message server (4) accesses a database (6) after the message is stored and determines from the data thereof at least one piece of information that can be associated with the call number via the technical features of a recipient terminal (3a, 3b, 3c, 3d) of the recipient, wherein depending on the information, a specific recipient message is transmitted to the recipient terminal (3a, 3b, 3c, 3d).