How did mail get meghan's letter

I think there may be some confusion here!

Meghan Markle, the Duchess of Sussex, is a public figure, and her personal correspondence is not typically delivered by mail. As a member of the British royal family, she likely has a team of staff and security personnel who handle her correspondence and communications.

It's possible that you may be thinking of a different person or situation. Could you provide more context or clarify what you mean by "Meghan's letter"?