How to know undisclosed-recipients in outlook?

I have received the mail with undisclosed-recipients, How can i see the same?

2 Answers

Undisclosed means just that. You can't see them because they're not disclosed. The email was sent to BCC (blind carbon copy) addresses.

You don't. This would indicate the sender used BCC: instead of CC: thereby masking the list of recipients with no addresses shared among recipients. Apologies for a lack of solution...