Article ID: 2276432 - View products that this article applies to.
After installing Forefront Protection for Exchange, Outlook's "Block Sender" does not work and Exchange's IMF (Internet Message Filter) functionality fails to work as well.
By default when Forefront's anti-spam agent deems a piece of mail as non-spam (clean) it sets the SCL rating of that specific message to -1. This has a negative effect on the Outlook "Block Sender" functionality, and Exchange's IMF, because mail that receives a rating of SCL -1 will be exempt from Outlook's Block Sender rule as well as Exchange's IMF functionality.
The workaround is to edit the SCL value that Forefront Protection for Exchange applies to "clean messages".
The following work around will change the Forefront Protection for Exchange SCL clean value to zero (0). This is done in Forefront's Power Shell by creating a new extended option:
This should return the following: CFAllowBlockedSenders True
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Article ID: 2276432 - Last Review: July 7, 2010 - Revision: 1.0