When I SSH into my AC88, I found a text file (dead.letter I think) with the e-mail alert... i.e. the router's attempt to e-mail the alert to me that never got sent.
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Do you have 2 factor auth set up in the Google account and are you using an app password as the account’s password?
https://www.snbforums.com/threads/a...essage-invalid-link-to-tti.58367/#post-513477