Alert emails don't arrive
Check your spam folder, add the sending address to your contacts, and make sure Email is turned on.
Check spam
Alert emails come from alerts@polarlights.io. Look in your spam or junk folder, and in tabs such as Promotions or Updates. If you find one there, mark it as not spam and add alerts@polarlights.io to your contacts, so the next one reaches your inbox.
Check the address and the switch
Open Alerts. Under Deliver via, Email should be on, and the address shown under it is where alerts go: your account's email address.
Was an alert sent?
Recent alerts, on the Alerts page, lists every alert sent to you. If nothing is listed, no alert was sent: see I didn't get an aurora alert.
Account emails
The confirmation link when you create an account and the password reset link come from the account service, not from alerts@polarlights.io. If one doesn't arrive within a few minutes, check spam, then ask for it again. If you're told there are too many attempts, wait a few minutes first.