How can I determine whether an email I've received contains a virus/worm?

If you receive an email that has a random, strange, or blank subject line and has one or more attachments, it may very well contain a virus or worm, and should be handled with caution. Do not open it or click on any of the attachments, even if you know the name of the person on the From: line.

If you receive an email that contains an attachment that you are not 100% sure is ok, delete it the email.