How secure are emails sent to a Teams channel?

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We are exploring the option of having individuals from outside our organization email sensitive information directly to a Teams channel.  It would be scanned in Outlook via an iPad and emailed to the channel directly.  How secure is the information that they are sending in to us?   Thank you in advance for any information.

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The email functionality is fairly limited, so I'd advice caution here. Moreover, the way messages sent to a Teams channel are routed is sort of a "black box", you will have no visibility on how those messages are being processed and even less control over which policies will take effect. Use a regular mailbox, shared mailbox or the Microsoft 365 Group for the team instead.