Accused of Spamming

[HerbAndEdnaWeinstein]

Hi, my 50-user domain was recently added to a spammers' blacklist and I'm not sure why.

About two weeks ago I upgraded from Exchange 2000 to Exchange 2003. I added an additional IP address to hit our computer, but it's only for Outlook Web Access traffic, and only Port 80 is allowed.

From the spam report I could find, the IP address for our Webmail (and not the IP address for our SMTP server) is the one blacklisted. It was accused of sending about 10 spam messages.

I have lots of questions, but how might I start homing in on the origin of this supposed spam?

Thanks for any hints at all,
Herbie

 

[Marcs41]

Start by asking whoever blocked you to provide you with proff, like a full header.
Check for your IP in there, not just a domain name.

Marc
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[Zelandakh]

You may have been stung by reverse DNS.

Check your public IP's DNS name. It may be something like xyz.abc.yourISP.com and if your ISP has been blacklisted, you fall with them too.

You need to have them remove the reverse DNS and have your domain tag holder add in OWA.yourdomain.com or whatever.