We currently use google as our email provider for our business email and management has asked me to block all webmail with the exception of gmail. I was going to try whitelist gmail.com and mail.google.com but it appears that most of the time when the users access these sites they come across as IP addresses. I began allow these addresses as I could find them but this seems like a very long and tedious process and isn't working very well. Is there a way to fix this so my users can get to gmail and not other webmail sites like yahoo etc.?
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