Prevent accidental disclosures with new Reply All BCC warnings in Gmail

To help protect your privacy and ensure intentional communication, we are introducing a new caution notification in Gmail. This feature is designed to prevent accidental information disclosure by alerting users when they are about to "Reply All" to a thread where they were originally BCC’ed.

Previously, users might inadvertently reveal their presence on a confidential thread by hitting "Reply All" while BCC'ed. With this update, Gmail will now display a prominent warning prompt to confirm your intent before the message is sent to all recipients, ensuring that your participation remains private unless you choose otherwise.