We have temporarily withdrawn the public beta to improve the way it handles the disabling of old Gmail POP/SMTP definitions. In its current form, there are certain types of definition (particularly those that use a simple username as the login component, without adding the full '@gmail.com' suffix) that the Gmail setup code will not detect and disable correctly, leading to confusion when the old definitions remain in use but fail. We expect to re-release the public beta in a couple of days. Our apologies for any inconvenience this might cause.