Prevent accidental disclosures with new Reply All warnings in Gmail

[Update: September 2026]: We have updated the banner language to be more general: "You’re not on the recipients list, replying to all lets everyone know you were included."

This warning displays whenever a user attempts to "Reply All" to a thread where their address is not listed in the To or CC fields (such as BCC'ed, auto-forwarded, or delegated emails), preventing accidental disclosure across all these scenarios.

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 are not listed as a recipient in the To or CC fields (such as when BCC’ed or receiving forwarded mail).

Previously, users might inadvertently reveal their presence or personal address on a thread by hitting "Reply All" when they were not an explicitly listed recipient. With this update, Gmail displays a prominent banner—'You’re not on the recipients list, replying to all lets everyone know you were included'—to confirm your intent before sending to all recipients, ensuring that your participation remains private unless you choose otherwise.

Getting started

• Admins: This feature is available by default.
• End users: This feature is available by default and will trigger automatically when a recipient not listed on the To or CC line attempts to "Reply All" on a thread.

Rollout pace

• Rapid Release and Scheduled Release domains: Available now

Availability

• Available to all Google Workspace customers, Workspace Individual subscribers, and users with personal Google accounts.