You might want to try a programme called MailWasher - I know quite a lot of forum members use it. With this programme you see the email headers on the server and can delete them, and bounce them back if you want. If you're not sure if it's spam you can preview the message. You can then download only the ones you want. It's available from click here
It's free to download and you can pay for it if you want to - it's up to you.