FAQ: Norton Safe Email here
Fix Norton Safe Email Product Errors here
Set up Norton Safe Email here
Supported Email Providers monitored by Norton Safe Email here
=============================================
may be related:
https://community.norton.com/t/norton-safe-mail/230222
https://community.norton.com/t/lost-access-to-this-email-account/231808
https://community.norton.com/t/norton-safe-email-is-unable-to-flag-emails/231844
Caveat: I do not run Norton Safe Email