How can I stop someone from using my address as their return address?

> From: A Computer User
> Sent: July 8, 2005
> To: Ask Leo!
> Subject: How can I stop someone from using my address as their return address?
>
> Leo,

> I need some help. I am getting return mail from someone
> sending span out and using my email address as their return
> address. How do I stop this. I get about 50 / 100 returned
> (email blocked) messages a day.
>
> How can I stop someone from using my address as their return
> address? I use this address for business so I just can not
> turn it off.

I have an article on that:
http://ask-leo.com/someones_sending_from_my_email_address_how_do_i_stop_them.html

Thanks for asking!

Leo