from The Secretary's Desk Book, 1935:
#27. The Evil One.
The names of the Evil One should begin with capitals. Satan. Satanic Majesty. The Devil. The Adversary.
I'm trying to imagine how many secretaries in 1935 had the opportunity to actually implement this rule.
To: The Adversary, Hell. From: Harvey's Menswear, Toronto. May 13, 1935
Dear The Devil,
It has come to our attention that your account is now thirty days past due. Please send cheque or money order. Thank you.
Very Truly Yours, etc.