Don't think so any more than usual
I've been getting several 'undelivered email' notifications by the hour to non-existent addresses from a non-existent email address based on one of my real email addresses (one that appears on some of my business letterheads)
Obviously some dickhead has tried to hijack it presumably to send out a virus or trojan - but nothing you can do about that, par for the course. If you want to, you can just create an address in Outlook Express such as
pzxwhjj@microsoft.com and send out emails via these pathetic anonymous proxys that are around.
If people aren't protecting themselves against stuff sent out by jerks like that after all that's been doing the rounds lately, more fool them