If I send my CRUSH a love letter through mail to his address, will he know it’s me?

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I want to send a love letter to my crush, but I don’t want him to know who it is. Since we had worked before I know his home address. I never spoke with him or confessed my feelings for him, because I thought he didn’t like me. I want to send him the letter as a last farewell and let him know how I felt.

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Is there any possible way for me to mail it, and him not to find out who sent it?

If I send my CRUSH a love letter through mail to his address, will he know it’s me?
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