The "From:" address in an email is whatever the sender chooses to set it to. (Ditto the "Relpy-To:" and various other sender identifications.)
I can send email claiming to come from you, nobody will or can stop me. You can send email claiming to come from me, nobody will or can stop you.
The only thing you can do about it is to stop worrying about it. Mostly these joe-jobs stop after a few days anyway.