What's the best practise to manage the e-mail crypted with the external collaborators? I made the protection rule with for "only recipients" but I have a lot of problem with this label.
It may be worth looking through this best practice from one of the MS partners
Hope this helps!
using "Encrypt Only" in outlook would take care of emails including the ones with Office attachments. In addition now there's a support for PDF documents (as described in above article).
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