The Mailing Preference Service (MPS) allows consumers to register
their address to say that they do not wish to receive postal direct
mail offers from companies with whom they have no existing business
DES can compare your database with the MPS Suppression File so that you can ensure you only use appropriate methods of communication to such individuals.
Where you have already built up a communication with the individual
and it is reasonable to assume that they would not mind your continuing
to contact them, then you may continue to do so even if the individual
is on the MPS Register, however should they request that you stop
mailing them, you must do so immediately.