Symptoms
gTLD domain owner email verification is started, then domain owner email changed to another one, but former email address still receives verification reminders.
Cause
Once email verification is started, it is finishes either once address is verified, or verification deadline is reached, regardless of the current domain owner email.
Resolution
Email either should be verified or notifications ignored until deadline. Once its reached - notifications stop.
NB: Verification reminders should be ignored only if one is sure there are no handles with this email tied to gTLD domains. Otherwise, these domains will be suspended