Possibly? It's possible that the emails were sent on a data pull at some point, and in between data pull and emailing, you deleted the classic site. Or potent

Possibly? It's possible that the emails were sent on a data pull at some point, and in between data pull and emailing, you deleted the classic site. Or potentially there was a wire crossed somewhere. I apologize for the extra email either way - if the Classic Sites Manager shows no sites, you are good to go.