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Those attacks through the firewall require a level of sophistication that far exceeds your average cracker. If your assets are not of _critical_ value then the potential for loss is probably negligable.
And if your resources are that important that that type of attack would be an issue you should consider running a mail system that is still supported by the vendor. Exchange5.5 is no longer a supported product unless you also bought the software assurance package with your licenses. If you have software assurance there wouldn't be a reason for you to not upgrade, so I would guess that you don't have software assurance.