I would suggest that you look at an anti-spam tool which can delete emails from the email server and not after they have arrived or are being delivered to your system. I know they are viruses, but most anti-spam programs allow you to filter/mark for deletion suspect files.
I use MailWasher Pro (there is a free version which only monitors one email account), one of the best paid for programs on my system, there are others but ensure they can delete from the email server. Mailwasher views the first xx lines (where xx is the number of lines you decide) of the email in text mode, no attachments, it does its thing flagging spam, etc. and you can tick those you don't want. When you click process those email flagged for deletion are deleted from the email server, it then calls your email program so you can download the remainder, which should effectively be clean.
Do you really want to download email whilst you aren't there, I know that this requires you to be there to run Mailwasher, but over all this has saved me a lot of time, especially as I don't have to download the spam or suspect files over my dial-up connection.