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fighing email scam

A malicious web site started sending emails to people with our company name . they put our name but using a strange domain name (wanadoo.fr)

Anyways to stop them ?
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akhalighi
Asked:
akhalighi
2 Solutions
 
Paul MacDonaldDirector, Information SystemsCommented:
Use a spam filter.  They're not 100% effective, but modern ones do a pretty good job.

That said, your first line of defense is always an educated user.  Make sure your people know to not open e-mail from people they don't know.
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vSolutionsITCommented:
Go through below articles..can be helpful. Also check if your server is open relay or not..
Scan your entire lan with latest antivirus to detect any spam generating virus/software exists in your lan.

Which version of exchange you are using ?

http://blogs.technet.com/b/fareedmk/archive/2007/06/26/how-does-a-reverse-ndr-attack-work.aspx

http://www.groundtactics.com/2010/10/14/fighting-exchange-reverse-ndr-attacks-2007-and-2010/
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akhalighiAuthor Commented:
folks , Sorry but you got it wrong .

1- they are not hacking us or using our email servers . they are using a display name as our company name . the actual email address that they are using is some strange domain : wanadoo.fr .

2- Our employess do not receive anything ; these emails are surfing the Internet ,so we received some calls reporting the scam.
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Paul MacDonaldDirector, Information SystemsCommented:
There's nothing you can do about someone impersonating your return e-mail address, short of using an SPF record in your DNS.  Even then, it's not effective unless the receiving SMTP server bothers to check your DNS for it.

Ultimately, the problem is out of your hands.
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Neil RussellTechnical Development LeadCommented:
If they are NOT forging your address in the actual email address and nothing is hitting your servers then there is absolutely nothing at all that you can do to stop them.
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