If you get an e-mail that looks like this:
If the message will not displayed automatically,
follow the link to read the delivered message.
Received message is available at:
www.yahoo.com/inbox/xxxxxxxx/read.php?sessionid-xxxxxx
from anyone, do NOT click on the link. I'm sure you're all savvy enough not to do so, but for anyone who hasn't seen this sort of thing, it is particularly vile form of spam/virus delivery.