on the basis of filtering for illustrating this alternative fig4 shows exemplary electronic information which here preferably is a multimedia message 40 in this example the multimedia message is a wap message and particularly a message according to wsp protocol which has general wsp headers 41 which are described in more detail in wsp specification a field 42 for the message class information according to the invention as is shown in fig3 b as well as for possible other header information 43 related to the multimedia message and a message base 44 i e the actual electronic information as in the case of a multimedia message mpeg video 45 and text 46 the message class information can be included in electronic information in different ways there can directly be e g a mere subclass wherein the information has been classified or there can be both a main class and one or more subclasses thus class information may include the information u201c i personal i 1 mobile origin personal and i 1 1 from terminal and preferably the information is divided into fields of their own in the manner shown in fig3 b preferably in the header information in the field 42 in the example shown in fig4 there may further be other information required for the.