OT: E-mail address being used for spam?

[Matthew Godycki]

Over the course of the last few days, I have noticed that
I'm receiving a large number of "Undelivered Mail Returned
to Sender" type e-mail messages in my Inbox.  These are
all occurring for messages I definitely did not send (as they
are clearly bouncebacks of viagra-type spam messages).  
I'm guessing that someone may be using my e-mail address 
and spoofing it as the "from" address when sending out 
spam.  Is there anything that I can do about this?

For what it's worth, I don't even use (nor have I set up) any
e-mail clients aside from web clients.  So it's not likely that
I've got a virus/trojan on one of my machines.

-Matt

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