> 
> Anyone can change their from address to one in your domain.  So when they 
> bounce they will come back to you.  You probably have not been hacked, but I 
> would change passwords as a precaution.
> 

Yes, in the early days on the fight against spam, the mail programs were 
changed so that the "from" and "reply-to" addresses were checked for validity. 

This meant that a spammer had to put (ANY) valid email address in there, and 
the mail would go through. 

If running windows, you could also have a computer virus; some of these appear 
to go through your emails and pick and choose valid email addresses. I'm out of 
the Arpanet/Internet/etc management for 10 or so years, so I'm not up on this 
aspect of spam.

JohnS.
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