I'm looking for an EDL that would have all the free email services (@gmail.com, @yahoo.com, @hotmail.com, etc..) Is anyone aware of anything like this, that is maintained, or would we need to build something?
If you use URL filtering, you coud just block the Web-Based-Email catagory. If there are some that you need to allow, you can just whitlist those above your policy that blocks.
The URL option mentioned by @OtakarKlier is likely going to be your best option. The issue with attempting to do this via IP for example is that you need to allow a few of Google's netblocks as the IPs change constantly, which will allow other Google services that you might not actually want.
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