@ naz: If the things were gonna be so simple then by this time Dutta-Nakku love story would have reached its peak 😆. Ok, jokes apart; yes, if Dutta reads letter he will be totally 😕. It is also possible that he might not accept the blame on Nakku and consider her innocent, which she is. Possibly he will withdraw himself in the shell, as Shreya said in her post. Right now it's very difficult to predict Dutta's outburst to the whole situation.
And definitely Malmal is required, may be not to actually start TaSha love story but to prove Nakkus importance in Dutta's life or make him realise that he too loves her.
Now I am sure Dutta will "find" the letter. Otherwise why will Naku get blamed ie assuming the article is right.