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Mostly we create Exchange Transport Rules Condition using the criteria’s like “when FROM address ...”, When recipient ...” “When user from inside/outside organization” etc. Recently I have come across to create a rule for filtering the emails from internet groups, and the from address will always shown as the primary email address of the sender which could be always well known internet domains like gmail.com, yahoo.com etc, not the news group domain name. Most of the company wanted the email traffic from those public domains, by restricting the email traffic which are send to common groups (news group, community groups and other non-business groups).

To work with such request in transport rule, you can use the condition “When the message header matches text patterns”. Before we create any rule, let’s look at the header of one such email and decide on the parameter which can be used for filtering such emails (common criteria for all such emails).

Select the “When the message header matches text patterns” from the condition list(Step 2). Click on message header and enter the value ‘Mail-To’ and then click on the text patterns and enter ‘@internetgroups.com’, it will look like below after you enter these values (Use the required text pattern according to your need).

Now proceed to the next step, and select the desired action that you would like to apply and finish the wizard.

You can use the message header option to implement very specific filtering criteria.

-Praveen