Exchange 2010 Transport Rules Space Limit

We are using an Exchange Server 2010.  I have created a transport rule that inspects the subject field from users outside the organization for words like Invoice, Receipt, Statement, etc.  I have the email redirected to an account for spam.  In the exception area, the rule inspects the From address for email addresses or domains of allowed senders.

The rule has run out of space and I cannot add more addresses/domains.  There must be a better way.  I need some direction.
rrinconesAsked:
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timgreen7077Exchange EngineerCommented:
what kind of spam and malware solution are you using in the perimeter before it hits your exchange server. i would use that solution for managing spam instead of Exchange Transport rules.
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ferraristaCommented:
Agree with the above comment. As a mitigation, have you tried to configure multiple rules that work together ?
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rrinconesAuthor Commented:
I have but I don't get the results.  I tried using a rule, that if the email address matches one on the list, pre-append a safe word on the subject line.  that safe word will then allow the email to get thru the next rule.  I don't think the pre-append gets written before it hits the next rule, which then forwards the email to spam account.

We have a sonicwall, it has a service for filtering spam but isn't licensed.  I am going to investigate that route.
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timgreen7077Exchange EngineerCommented:
Yes filtering on the perimeter is a far better option. Good luck.
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rrinconesAuthor Commented:
Activated a trial license of Sonicwall Anti Spam and am in the middle of configuring it.
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