Erasing authorized accounts (on Mac)

I have one email connected with adobe account and a second email that is connected with the university (so i could download my textbook purchace. However I  need to deauthorize my university email but I can't remember which password was used, I've tried all possabilities and because it isnt the mail email I cant reset it. Is there a way to comepletely get rid of the entire account and start from square one.