The Royal Mail
has a duty to deliver that mail, like it or not.

Better to get back at the company that's spammed you by using the pre-paid envelope they've inevitably enclosed, and filling it their own spam, or granny pr0n, or something that will make it overweight. That way Royal Mail get to charge them for the privilege of receiving shit.
(Vice Admiral Sir Charles Cockbrush KCB MBE DSO, who is finding it increasingly difficult to log into b3ta.com wants to duck your aunt and kick your puppy, Fri 18 Jun 2010, 10:44, 1 reply)

Oh yes, when there's a prepay I send it separately.
I do however like your overweight option. Next time...
( Blind Meach Cautiously optimistic, Fri 18 Jun 2010, 11:15, closed)

Alternatively
If you find yourself being constantly spammed by two different companies, put Company A's spam in Company B's envelope and vice versa.

Maybe not the spam with your address on, though.
(Vice Admiral Sir Charles Cockbrush KCB MBE DSO, who is finding it increasingly difficult to log into b3ta.com wants to duck your aunt and kick your puppy, Fri 18 Jun 2010, 11:44, closed)