Blocking uploads to personal Outlook - Cross Post

[typod]

Hi,

Posted this on the M365 Defender forum but might be better here.

Using MDCA or MDE is it possible to block file uploads to personal webmail services such as Outlook.com/Gmail etc.

I should add we have not deployed labelling yet, so that isn't an option.  It seems that would make this ask much easier!

Thanks

[#2]

@typod this can be accomplished using endpoint DLP, but it’s not possible with MDCA/MDE directly though.

[#3]

@Keith_Fleming thanks, I suspected that might be the case.