Who wrote this letter?

Cracked by: Supritha Maiya, Manish Achuth, Sumanth Patlolla, Saarthak Sachdeva, KK, varun, s m muneer ali, Shwetha Maiya, buk, Bipin Banavalikar, Abhiram Bharadwaj Diddigi, AmK, Rogi, bablu and Mayukh Bose