We have disabled the feature that users can share files to other users or external contacts in SharePoint Online. But sometimes they do send a link of a file to a colleague, if they are sure that the recipient colleague already has rights to open the file.
The action they do is opening Outlook (the real app and not webmail), creating a new mail, choosing add attachment to attach a file, choosing a file from the SharePoint document library, and clicking the add button. Outlook detects that this is a SharePoint file, and attaches a special link to the e-mail with a cloud icon on it.
Not the whole file is attached, but a link to the file in SharePoint. Great, the colleague always opens the newest version!
But, as soon as the user sends the e-mail to a colleague (even if that colleague has sufficent rights in SharePoint to open the file), the sender immediately receives a warning email from "Microsoft Outlook" (with some random e-mail addresses) with the following text:
You don't have permission to give others access to this file. The message was sent, but the following people might not be able to access the attachment: [email protected] You could try:
Asking the file owner to give the recipients permission to access the file.
Sending the file as an attachment instead of a link.
The question is:
How to disable these warning e-mails? We don't want Office365 to send these anymore since they are confusing for our users.