PLEASEEEEE HELP? MAILER DAEMON VIRUS?!?

So i have got around 200 emails from this "mailer daemon" and i already know it is a virus. I don't know how i got it, but i got it. Can someone please tell me how to get rid of this? I have got McAfee and a ran a scan on it and it said there were no issues. I have changed my password on my... show more So i have got around 200 emails from this "mailer daemon" and i already know it is a virus. I don't know how i got it, but i got it.

Can someone please tell me how to get rid of this? I have got McAfee and a ran a scan on it and it said there were no issues.

I have changed my password on my yahoo mail and updated my security questions, so now what?

Can someone please tell me how to get out of this mess? Your help is deeply appreciated! Please.
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