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?
you could try asking this question in the MineMeld forum
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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