Calling someone by their first name
I was wondering if you receive a letter or e-mail from someone and they sign it using their first name only if that makes it okay for you to call them by their first name?
Hypothetical example: You write a letter to John Doe. In your letter you refer to him as "Mr. Doe". He writes back and signs it John.
If I were to write back again would it be cool for me to just call him John, as opposed to Mr. Doe?
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