I've got a Linux VPS through RimuHosting - I'm no system admin, and the root account gets a pile of email spam. This takes up disk space so I try to regularly delete it. The best way I've found is to us Mutt - a console based email reader.
Firing up Mutt as root displays the thousands of spam mails recieved. Pressing 'D' lets you delete messages that match a pattern. So I can specify the pattern 'a' and that matches almost all of the messages. When quitting the application, it deletes the marked messages.
So, this is a good solution for reading or deleting many emails without downloading them - if you have ssh access.
To avoid having to do this, can anyone tell me how to stop receiving these emails?