Endpoint to get email address of the shared files and folders of dropbox user

If you get the 'account_id' for a shared member, e.g., as returned from /2/sharing/list_folder_members[/continue], you can then use that value to get the account information from /2/users/get_account.

Suppose if we share a file or some one shares a file with us. Is it possible to get their email address?

It sounds like you're referring to the "shared file" type of sharing covered by /2/sharing/list_received_files[/continue] in particular. No, the Dropbox API doesn't list the owner or recipient for this kind of sharing, but I'll pass this along as a feature request.