If the guy who already works there has a responsible position with the firm and you know for sure that 1) his employers would value his opinion and 2) he has no objection to you doing so, I would mention that you are sending the e-mail on his prompting.
If he has told you he is the CEO I would be a bit dubious about his true position though.
When he finished University my son sent loads of e-mails to firms who he thought could possibly employ him and, after briefly introducing himself, usually said that he had been looking at firms in our locality who might be interested in someone with his qualifications and enthusiasm and could they please keep him in mind if any employment vacancies came up in the future.
Rather than have your e-mail drift around the firm I would seriously consider sending a letter that you can send directly to the Recruitment Team.