Highly recommended is MailWasher - I use the unsupported freebie.

It allows you to set up rules etc, and sort thru the incoming pile - looking at the subject lines and senders and see if you are correctly there as a proper recipient or just in the 'BCC List' - even peeking at part of the text without damaging your machine.

You then delete the crap - and take FAR less time to do your mail download - especially since many viral loads need about 30 Kb to carry the infection - you can even tell if there are the typical sorts of attachments that nasties come with, especially in Multifart MIME message attachments.