How to stop emails notifying me I just logged into 1Password in Safari

Hi @Gramps4, that would explain it. That Safari data is one of the things 1Password uses to determine either "it looks like this is the same user and device, just logging in again" vs. "hey, this login might be from a new device."

If you do experience this even when not clearing Safari's browser data, let us know and we'll be happy to look deeper - and thank you for raising this issue.