for Google Workspace / for Microsoft 365
How can I confirm the recipients of the Bcc recipients?
If the Email is temporarily suspended or requires approval from the manager, you will be able to find the Email under "Suspension" and "Approval" in the user console.
In "Suspension" > "Me" and "Team" or "Approval" > "Pending Approval", if you click on the specific Email, you can find the Bcc field.
However, there is no difference between Bcc Emails added by the system and by the original sender.