How this could hurt my business?

Hi

I noticed someone send an email with my email account in the from header...

I was concerned I had a 'open relay' issue but after veryfing maillog I think, my server is not relaying...

If this guy continues 'sending' mail with my account name but not from my account nor my SMTP server, How that could affect me?

How to deter a person from using from:
clemens@mydomain.com

I have search and there are some alternatives but I not want to pursue them right now. I don't wan to mess with MTA, I have a hardened sendmail and it seems to be working fine...

Your opinions are welcome...!

 

 

 

 

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