Mail server (postfix) in ubuntu unable to send email to hotmail?

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http://serverfault.com – Recently i installed a mail server inside ubuntu to send mail for my user who forgot password. I installed a few packages: apt-get install php-pear pear install mail pear install Net_SMTP pear install Auth_SASL pear install mail_mime apt-get install postfix After i installed these packages, i create a php file and placed it inside my htdocs. I try out gmail and yahoo, it works fine but when i put hotmail as a recipient, i cant receive the mail. Can i know how to configure the setting to allow it to send to hotmail? (HowTos)