I seem to be getting a lot of hacked emails. I use Mailwasher but I am unable to bounce them as they do nor seem to have return address. Many of them end up with this link: http://beststing.com/close.htm (do not click on this). The name says it all, doesn't it?

What I don't understand is why the ISP (in this case Yahoo) lets them through. It's criminally irresponsible.

   I never bounce emails in MailWasher because a real spam email is not going to have the proper return address anyway.
   I used to think that if ISPs would block virus emails we would not have a problem with them today but then I started writing a newsletter.  Many issues of the newsletter have been blocked because they had certain words in them (mainly from the articles about viruses) and now many ISPs block the account that sends out the newsletter even though it has never sent out spam.  Yet I see virus emails get through all of the time.  That makes me wonder if ISPs would properly block virus emails anyway?