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Source: https://writers.stackexchange.com/q/4376
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

My email client includes a signature beneath the text of my writing. Currently it is of the form:

    ------------
    John Doe
    Acme Widget Company
    123 Elm Street
    Metropolis, USA
    phone:222-555-1212
    email:jdoe@gmail.com

When I write an email, how should I sign this? For a formal letter, it feels too informal and a little bit redundant to sign with just my first name, and very redundant (because of the signature field) to sign with my first and last name:

    Dear Prof. Foo
    
       Please help me solve 1 + 1.
    
    Sincerely,
    
    John Doe
    
    ------------
    John Doe
    Acme Widget Company
    123 Elm Street
    Metropolis, USA

I have also seen emails where the name is left off, and the signature is all that remains:

    Sincerely,
    
    John Doe
    Acme Widget Company
    123 Elm Street
    Metropolis, USA

Are there any formal conventions for signing such a letter? What other approaches exist?

Original score: 2