7 Lettered Word

Its A 7 Letter Word.
If We Remove 1 Letter From It, It Remains Same.
If We Remove 2 Letters From It, It Remains Same.
If We Remove 3 Letters From It, It Remains Same.
If We Remove All The Letters From It, Still It Remains Same.
Whats It ?

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Postbox

I guessed this also

I guessed this also