Creating a global rule to handle mail flags by my firewall

On my firewall I can append the subject all detected spam or the header.  I would like to do that and then have a global rule for all exchange accounts that will based on that header or subject filter the mail into the junk email folder.

Ultimately what I am trying to do is write a server side rule for all mailboxes or identify a phrase I can set all messages to that will always be captured by the spam filter.
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You can do that on the rules wizard for outlook client wherein you set a rule for each and every user (which will be server side) and captured on a junk folder that can be created in their inbox. As this is a server side rule, it will be applicable everywhere the user logs in.

This is very much possible.
But are you trying to set a global rule on the exchange?
If you are using Exchange 2003 SP2, you can do this with Intelligent Message Filter, and a Custom Weight entry:

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rugby148Author Commented:
I am looking into the custom weight entry suggestion.

I unfortunately cannot do this from the client.  Over 500 mailboxes are being used and to many support limatations exist for users being asked to set this up.  I need to incorporate this as an enterprise setting.
rugby148Author Commented:
Please hold off.  I am still reviewing / testing variations of LeeDerbyshire's suggestion and would like to award points in appropriate.

Any update here?
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