You want me to make this a really
Ok, are you trying to send an e-mail through your server from a hotmail account. If so, this is your problem:
Your server (quite rightly) is stopping the sending of mail through it that is not from your domain. This is a security feature to stop spammers hijacking your server for their evil deeds. You need to get your Dad (aka the sys admin
) to configure so that it will allow relaying from either that specific e-mail addy or just from that domain (hotmail.com) in general.