How would you sign a letter that addresses a person you do not personally know?

Sure, here are the steps to sign a letter that addresses a person you do not personally know:

1. Conclude the letter: Before signing off, you should conclude the letter. This could be a simple sentence or two, summarizing the main point of the letter or expressing your hopes for future correspondence.

2. Use a formal sign-off: Since you do not know the person personally, it's best to use a formal sign-off. Examples include "Yours sincerely," "Yours faithfully," "Respectfully yours," or "Best regards,".

3. Leave space for the signature: After the sign-off, leave a few lines blank for your signature.

4. Sign your name: If you're sending a hard copy of the letter, sign your name in the blank space you left after the sign-off. If you're sending an email, you can either type your name or insert a digital copy of your signature.

5. Type your name and contact information: Below your signature, type your full name. If it's a formal letter, you might also include your title and any necessary contact information below your typed name.

6. Add any necessary enclosures or cc's: If you're including additional documents with the letter, note them at the very bottom of the letter with the word "Enclosure" or "Enc." If you're sending the letter to more than one person, note the other recipients with "cc" (carbon copy).

Remember, the key to signing a letter to someone you don't know is to keep it formal and respectful.