I've had people use my domain name over and over, sending, primarily virus laden email. It hasn't hurt my business at all, except when my own host blacklisted my domain. All of a sudden, no email for 3 days? I got that taken care of. My host has log in security for email and no one is running email through my server, but spoofing. I've looked at the headers of the email for abuse but haven't noticed anything. Of course, I forward all the email to Outlook Express through my ISP which then changes all the headers again.
The last week I've been getting 400 virus laden emails per day, most from someone spoofing my domain.
I looked over some of the information above. Looks pretty difficult to stop these thing and technically, pretty time consuming.
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