I journal I recently submitted a paper to asked me to suggest two referees, which I did, with explanation of why I picked them as referees.
While I was writing the paper, I had informal email exchanges with both of them. I was wondering if it is unethical on my part to drop an email to each of them stating that I suggested their name to referee my paper? If it is, totally understandable, but if not, is it still unethical to send them a copy of my paper for which I suggested them as referees? I'm guessing yes, but double checking.