How do I address an email in Latin to my Latin professor?

1. How do you address a Latin teacher?
2. How do you address a professional in an email?

How do you address a Latin teacher?

Typically in Latin class, one addresses your teacher as Magister/Magistra. In your case, the previous might still be applicable, but Professor/Profestrix may work here as well.

How do you address a professional in an email?

Salutation: The salutation of a formal email is similar to the salutation of a letter. When writing to someone you do not know by name, you put “To Whom it May Concern.” When applying for a job, you would address the person by, “Dear Hiring Manager.” If you do know the recipient's name, you put “Dear Mr./Ms.