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Spammers using mail domain name

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3 replies

by destab

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I have received complaints the spam is being received from a company email address Postmaster@domain.co.xx (No mail account exists of that name on the domain)
Someone has stolen the domain name and used it to promote their mortages etc. They are using the external ip of the router which leads me to believe that it is from a dns server they have obtained the domain name.

This domain is a Brokers firm and this is causing a lot of turmoil. I am at a loss as to how to stop this has anyone gotthe answer.

Exchange 5.5 on win2000 server through a router w/ firewall
The war on spam has just got personal!

3 replies

by r. a. caluste

I had the same problem once and found out that I have an open relay. I have since fixed the problem and stopped spam. Many spammers out there can get your MX record using nslookup using your domain name and a valid dns server. They then use your server to relay and forward their spam. If you suspect that you have an open relay, go to http://www.ordb.org (no space in url). They can test if you have an open relay.

To close your open relay, I would suggest the ff site for Exchange 5.5 (no spacein url):
To prevent SMTP relaying with MS Exchange 5.5
http://www.slipstick.com/exs/relay.htm

hope this helps.

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