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Could electronic mail undermine conventional post? – archive, 1 December 1983
(www.theguardian.com)
This is a most excellent place for technology news and articles.
We hate delivering them just as much as you hate getting them. Your best bet is to call the companies sending them and have them remove your address from their mailing list.
You could also go to the full extreme of just removing your mailbox and getting nothing, but sadly that also includes any packages sent through the USPS. They'll get returned as No Mail Receptacle.