this may sound stupid but after clicking reply are u sending the email? ^^.
is your wiiconnect24 set to 'always on'? in the wii options?.. i set mine to always on from the beggining so im not sure of the differences with it off.
iv sent a msg to my wii so will update this post if mines working(usually takes 10min to arrive on wii) incase it might be a prob at nintendo.
edit: yeah im getting mails on wii from my hotmail address