On one of my first qualified jobs, my manager (a lovely older lady) did exactly this. All incoming emails were printed and put into a binder. Then she would go home, write an answer with a pen on the back side of every single one, and on the next day write a new email to the recipient. 10-15 % of all emails she sent this way would bounce because she had written the address incorrectly.

When I showed her the reply button in Eudora (this was in 2001), she was so happy that she bought me a cake.

She struggled with IT but was tack sharp otherwise. So far she's the only boss I've ever really liked.