Dear Sir/Madam: If your inbox is like mine, it’s full of emails that sound like either a nineteenth-century love letter or a text message from a teenager.
To be fair, this isn’t anyone’s fault. As a society, we simply don’t teach email etiquette or retrain professionals as standards change. If you were fortunate enough to take a Business Writing class, you likely learned salutations (“Dear Sir/Madam,” “To Whom It May Concern,” “Cordially,” etc.) and how to format a cover letter and write a formal complaint.