Contacting other Players

Is there an easy way to contact players? (When my first game ended I would have liked making comments to my partner, but I didn't find any possibility)
It would be nice to be able to leave comments to other games too, if the players wish to have such an option (ie: commenting or learn mode)
Nice would be a feature like Comments waiting like it is already with Games waiting. Just with personal messages from other players. (so you would not have to publish your email adress) - could be used as addition to the impersonal forums.