I've had this email account on Thunderbird for years (along with others) via Gmail, and the others are still working but as of this morning this one won't, error message says: "400. That’s an error. The server cannot process the request because it is malformed. It should not be retried. That’s all we know." The email is working fine still on my i-phone, just not on my Thunderbird mail client on my Mac desktop. I tried removing the email account from Thunderbird and re-adding it, but it won't re-add due to the same error message. What to do?