John's co$-$worker explained that emails were used instead of letters when responding to complaints. She explained that John should use the same content as a letter would use and that there are no other changes. Should John follow this advice? All of the advice is correct. Almost. John should take extra care with the subject line. No$,$ an email will be much shorter so is written in a different style. No$,$ am email should contain more details than a letter.