I was trying to setup an restricted network for students that have abused their internet privilege, the idea was to basically only allow Drive and gMail.
The reason I would like to use a blacklist in whitelist mode is to block chat in gMail. The gmail domain is mail.google.com, the gmail chat is chatenabled.mail.google.com. I can find no way to allow gmail without allowing chat without the use of a blacklist, hence this request.
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