Block webmail sites with ISA2004?

My director wants to block webmail access from internal clients. He asked specifically for blocking AOL, Yahoo, Hotmail, Comcast, Verizon, but I know more will be coming.

Is there an easy way to accomplish this? The only way I can think of is to get an account on those sites, check the URL's they use for mail reading, and blocking them. I expect that to take a while, so if there is an easier way I would love to know it.

Thanks for any help,
Dan
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drothbartAsked:
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Keith AlabasterEnterprise ArchitectCommented:
trying to do this in ISA alone will be a nightmare. to do this effectively you need an add-on. GFI web monitor would be a good candidate.

keith
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Stephen MandersonSoftware EngineerCommented:
I would second that, yet another plug for GFI :-)
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drothbartAuthor Commented:
GFI looks like a valid option. We have several thousand users, do you know how it scales??

We run ISA in a load-balanced array.
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