Q

How can I configure Exchange IMF to allow an IP address or DNS?

Find out how to prevent the Exchange Intelligent Message Filter (IMF) from identifying a specific external IP address or domain name system (DNS) as spam.

How can I permanently add an external IP address or domain name system (DNS) in Exchange Server that the Intelligent Message Filter (IMF) will not block as spam?

Exchange Server processes inbound messages in a very specific order. As messages are processed by the various filters, each filter has the ability to block the connection or email from being transmitted to the recipient(s). The Connection Filter, which is the first filter that Exchange Server 2003 processes, has two options: Block and Allow. If you allow an IP address using the Connection Filter settings, it will override the remaining filters, including IMF. Per the Intelligent Message Filter release notes:

"IP allow addresses under connection filtering allows mail to bypass Intelligent Message Filter, which results in messages that have no SCL value stamped on them. These messages can be filtered by Outlook 2003 Junk E-mail rules. Intelligent Message Filter does not specify an SCL by design because content scanning was actually bypassed. In this case, setting an SCL of 0 would not be an accurate value from Intelligent Message Filter."

The same cannot be said about Exceptions in the Connection filter, which has no affect on the IMF filter.

Do you have comments on this Ask the Expert Q&A? Let us know.

Ask an Exchange Server question in our forum.

This was first published in September 2008

Dig deeper on Spam and virus protection

Pro+

Features

Enjoy the benefits of Pro+ membership, learn more and join.

Have a question for an expert?

Please add a title for your question

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

0 comments

Oldest 

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

SearchWindowsServer

SearchEnterpriseDesktop

SearchCloudComputing

SearchSQLServer

Close