Gmail will now require verification to add forwarding addresses

Gmail is increasing account safeguards by now requiring verification to add mail forwarding addresses. This is also extended to editing account filters or configuring IMAP access.

As per updated security processes, when a user now attempts to change any of these settings, Google, "will evaluate the session attempting the action, and if it’s deemed risky, it will be challenged with a “Verify it’s you” prompt".

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If you have two-factor authentication set-up on your account, you will be prompted to enter the code. If the verification fails, users will be sent a "Critical security alert" on their linked devices. The feature will roll out for all Google Workspace customers, and personal Google accounts.