7 Letter Word - If You Remove One Letter From Me | with Answer

I Am A Seven Letter Word Puzzle with Answer

I am a seven letter word. 

- If you remove one letter from me my meaning does not change. 

- If you remove two letters from me my meaning still does not change, and 

- If you remove three letters from me, my meaning still does not change.

- Even if you remove all letters my meaning won't change. 

What word is this?

ANSWER

MAILBOX  (If you remove letters from the mailbox, still the meaning will be same)