I've just tried my first time at getting in touch with an author to point out some spelling mistakes in his story when I thought about how I was doing it and if it was the best/preferred method.
I would copy and paste the paragraph with any errors into an email, with a pointer to where the paragraph was in the chapter - I highlighted the error with a red background and then put my correction in square brackets next to it and high lighted with a yellow background - leaving it up to the author to do the correction.
Is it better this way or would it be better to just copy and paste the whole paragraph and do the corrections without pointing them out to the author?