someone using my email address to SPAM!

Hello,

I have some email addresses @mydomain.com and someone just put my email addresses in the "From" tag and send SPAM emails thru his Outlook using other smtp servers such as "eart*****", and I receive lots of bounded email saying some of the email addresses are invalid... so annoying, how can I get rid of it? I'm using those email addresses everyday, and receive tons of SPAM warning and bounded emails someone using my email address to SPAM!

PLEASE HELP!

 

 

 

 

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