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Prevent file upload from external parties
Hi, We have a bit of a security concern: Persons external to our company can without any notice initiate a chat to an employee and send a file. Is it possible to block either for external initi...
- Head over to Teams admin center and External access (under Users). Disable the option that consumer accounts can initiate a chat with your org. users. This isn't applicable for the "Teams and Skype for Business users in external organizations" setting which is federation. Because when using federation (also called trusted organizations) you cannot share files in chats.
You can prevent guest users (added to your org. with a guest account) from uploading files but that isn't the question here as far as I understand.
tsl65 How can they send a file? Federated chat to or from people outside your organisation doesn't allow file transfer.
StevenC365 We had the setting that Christian mentioned, set to allow contact from unmanaged sources.
(Teams accounts not managed by an organization)