How do I stop spammers from sending spam with my domain name attached to it?

I have gotten a whole bunch of returned emails in the last day or so. Someone is using email addresses at my domain name that don%26#039;t exist to send SPAM! How annoying and potentially bad for business. Any suggestions?

How do I stop spammers from sending spam with my domain name attached to it?

You cannot control what others do....don%26#039;t worry about it if it is your yahoo address....they can see in the header that you didn%26#039;t send it...

If it is your own domain you are using for email then you need to speak with your ISP....and quickly!