FYI: Gmail has locked my account for suspected unusual activity. I have a full archive elsewhere so I’ll be able to check old emails if need be but I won’t be able to check new mail.
I suspect it’s because of the forwarding rules I’ve setup (which span several accounts) compounded with a ‘fake’ from address in a few (< 10) emails that triggered this but I’m not sure exactly how or why.
Update: The lockdown has been lifted! Lasted for about 18 hours.