Google WorkSpace and Microsoft 365 process headers to prevent access to personal accounts, so I would like to ask if it is possible to do the same.

For Google and M365, it is possible if the email domain is controlled during login.

For example, it is possible to control login with @test.com, but login with other mail domains (@gmail.com/@yahoo.co.jp, etc.) is not possible with CASB.

For details, please see the CASB control video.
https://players.brightcove.net/6057277680001/default_default/index.html?videoId=6310093368112

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