We receive minimal mailings and don't subscribe to many catalogues as most information and products can be found on-line. Recently we are receiving sales flyers daily from a variety of sources. We must have got on a mailing list.
So I registered at mailing preference service to stop unwanted mail on my doormat.
The same happens with emails. Lots of products being offered that we don't want, so I am unsubscribing before deleting them.