Solved

A Question Regarding How RBL Works in Exchange 2007

Posted on 2009-07-10
2
267 Views
Last Modified: 2012-05-07
We are considering using free RBL services for the first time in Exchange 2007. We have an Edge server which catches most spam however some still slip through most likely because they are from newly infected bot machines. We are considering using some or all of the following free RBL providers:
zen.spamhaus.org
dnsbl.sorbs.net
bl.spamcop.net
dnsbl-1.uceprotect.net
If one or more RBL providers are added to Exchange when does it block the e-mail?  If only one reports it is on a black list?  If a majority indicate it is?  What if we use only one, e.g. spamhaus, and spamhaus is "down" when it goes to check.  Will the any and all incoming e-mail be queued up since it cannot be checked?  Or will it all come through unchecked? It will be appreciated if someone can help me understand how this will work.
0
Comment
Question by:adoughe
  • 2
2 Comments
 
LVL 15

Accepted Solution

by:
tntmax earned 500 total points
Comment Utility
From the following technet article:

http://technet.microsoft.com/en-us/library/bb124320.aspx

"If the IP address does not appear on the IP Block lists of any one of the IP Block List providers, the next agent in the anti-spam chain processes the connection"

It gets checked against all that you add to the list, after it has passed the explicit allow/deny lists.
0
 
LVL 15

Assisted Solution

by:tntmax
tntmax earned 500 total points
Comment Utility
The parent article is:

http://technet.microsoft.com/en-us/library/bb123943.aspx

And this section provides quite detailed over-view of the topic.
0

Featured Post

What Security Threats Are You Missing?

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

Suggested Solutions

Exchange server is not supported in any cloud-hosted platform (other than Azure with Azure Premium Storage).
Not sure what the best email signature size is? Are you worried about email signature image size? Follow this best practice guide.
To show how to create a transport rule in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Rules tab.:  To cr…
This video discusses moving either the default database or any database to a new volume.

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

8 Experts available now in Live!

Get 1:1 Help Now