Gmail now requires verification of forwarding addresses when using filters or autoforwarding

When setting up a new filter that forwards email or auto-forwarding email to a specific email address, you now need to also verify that you actually have permission to forward to that address. This is similar to verifying addresses for the ‘custom from’ feature.

There are exemptions to this change: Premier and Education edition users will not need to verify forwarding addresses that are:
- in their own domain
- in a subdomain of their own domain
- in a domain alias configured as part of the Google Apps account

Editions included:
Standard, Premier, Education and Partner Editions

Languages included:
All languages supported by Gmail

How to access what's new:
- Premier and Education Editions: If you are forwarding email to an address that does not come under the three categories above, then you will need to verify that address and a verification email will be sent to that address.
Email lists: If the list comes under the three categories, then verification isn’t required.

- Standard and Partner Editions: When setting up forwarding via a filter or autoforwarding, you will receive a verification email to the address that you are forwarding to.
Email lists: A user will have to verify that they have permission to forward to that list just like any other address and a verification email will be sent to the list. If the user has read access to the list, they’ll be able to get the confirmation code and verify the auto-forward address.

- Email Settings API: This API also allows forwarding to be configured. If the address being forwarded to does not need verification as outlined in the categories above, then this will work as expected. If the address requires verification and has not been verified, this setting will fail.

For more information:
http://mail.google.com/support/bin/answer.py?hl=en&answer=10957

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