There are a few means of mail that one could do. All three of these have been options by other people. In regards to myself, I will only communicate via email, and postal mail. Both of those options are in this section. There is also site messages. I will just use a site message to reply to the person once, while providing my email address. If you are only interested in communicating with just a sentence or two at a time, then you are might be better off communicating with IM.