An electronic mail communication system comprises a base station 1 and at least one portable terminal 2. The antisway bar includes a pair of arm portions and a torsion portion extending between the arm portions. The method results in dramatic non-transient improvements in motor control of the joint. A selection of one or more users associated with the automatically-suggested user information sent to the first computing device is received by the at least one remote computing device from the event location. The method includes the steps of providing at least two elements having different properties in at least one respect, the elements being designed for mechanical attachment to one and the same area part of the housing, one at the time, selecting one element from the set, and attaching mechanically the selected element to said area part of the housing. The system includes a proxy entity via which transfer of the authentication signalling is arranged, and encapsulated transmission of the authentication signalling to and from the mobile device is arranged in messages of a cryptographic client-server transport layer encapsulation protocol between the mobile device and the proxy entity.