Directory Harvest Attack - Postini


I have Postini spam filtering, and I just got an alert about a Directory Harvest Attack, along with offending IP address. What should I do, if anything? I have Exchange 2003 running on Windows 2003 Server.

thanks in advance.
Trevor LocalAsked:
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SembeeConnect With a Mentor Commented:
Unless you know the IP address (it is a competitor) then there is very little you can do. Dealing with directory harvest attacks is one of the things that you pay Postini to do. Have you asked Postini what you should do?

mario_andresConnect With a Mentor Messaging ArchitedCommented:
Postini, is very good service, outr company uses it as well.  The Welcome Emails that was sent to you have lots of good info on how to proctec your Exchange servers.  Also Please make sure your firewall has an access list  toOnly takes email from Postini.

Trevor LocalAuthor Commented:
so if I got a notice from Postini- that means they caught it?
got another one a couple hours ago too. I do believe my firewall is set up to only accept mail from Postini, I will double check.
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if you getting the emails from Postini, then they are catching them. What is the point in notifying you though?

mario_andresMessaging ArchitedCommented:
This is just good practice to only allow postini access to yoru Emails server (smtp Server).  Postini will qarantine virus and spam. So do not worry.  
Trevor LocalAuthor Commented:
well I've gotten 4 in the past couple days, haven't had one for a year and a half since using Postini.
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