I'm applying for a job through Indeed. CV all up to date & I'm happy with it. It says cover letter is optional. I don't want to do one but feel as though I have to. If you don't know the name of the person you're addressing it to, what's the done thing? Ring & find out, or just address it as "Dear Sir/Madam"? This sounds very old fashioned, I haven't applied for a new job in years, so I'm probably stuck in the dark ages.