Sort your spam
Tip: When looking through your spam folder, sort the folder by subject (most email programs, you just click on the word "subject" that's the column header to sort by that column). I do this so that I can see all the same spam at once. In other words, the subject is the primary criteria I use to determine if something is spam. I also glance at the sender but subject is usually a dead giveaway and sorting by subject allows me to evaluate each subject once.
This also helps when the occasional email comes through that looks legit but is easily determined to be spam because (1) it was received at several email addresses and (2) one or more of the addresses it was sent to are email addresses you don't use much i.e. your isp address rather than your domain address.
For more help with spam, visit http://www.premiumwebdesign.com/spam-filter.htm
Hope that helps!
Glennette