Question

I starts with M and ends with X . I have a never ending amount of letters who am I

Answer 1

Hey buddy
The answer is ' Mailbox '
Hope it helps
Thank you
♪☆＼(^０^＼) ♪(／^-^)／☆

Answer 2

Correct Question:
I start with M and ends with X. I have a never ending amount of letters. Who am I?

Answer:
The word is $\bold{Mailbox}$.

Mailbox contains huge number of letter so we can tell that it contains never ending amount of letters.