The invention relates to a stabilization of fluid oil-based suspensions comprising a hydrophobic silica, and medicaments based on such suspensions. The contents of a plurality of electronic mail messages are tracked and used to determine whether a particular electronic mail message is bulk electronic mail or not bulk electronic mail. According to the invention, the first element comprises a single ring mounted around the body, the body and the ring being linked following a combined relative rotational and translational movement by a second link between at least one guiding pin and at least one guiding slot.