Use Mailwasher to view emails by subject and sender before it is downloaded onto your machine. Simply mark the offending emails for deletion and then process them.
Only the ones you want will be downloaded locally.
Another great way of stopping the spammers cold is to use Sneakemail . This service is free and allows you to generate an email address (in the form of "h3482jsl294@sneakemail.com") for giving out to whomever.
All return email sent to this address shows up in your normal mailbox for whatever account you have now. All it does is add one extra hop to the route. If you start getting spam to that address...just login to sneakemail and delete it. No more Spam!
Whenever I have to give an email address to a website or such, I use a sneakemail address. You can create dozens and label them and add filtering rules on their website for each address.
Thanks for that sneakemail tip!