The BBC wrote an article on spam which you can read here.
Some key takeaways – according to Spamhaus more than 90% of email is spam 😮 BT, Bulldog, Wanadoo and Tiscali are failing to tackle the problem of botnets (spam sent from ordinary household computers that have been hijacked by hackers).
I’m not sure whether it is an omission or whether the 2nd and 3rd largest ISPs (Virgin Media and Carphone Warehouse) in the UK are doing a better job of dealing with this.