SMTP server force outbound traffic

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http://serverfault.com – I'm having some trouble with setting up a SMTP server on a windows server 2003 machine, while trying to send emails using PHP through the internet, but to domain email addresses. Common info: I'm a newbie on this, so I don't know many of the concepts Machine has Windows Server 2003 Server Machine on a domain (mydomain.com) Machine is not a domain controller Machine accesses a domain controller through the internet (WAN with a corporate VPN link by the internet provider setup on the machine's gateway - adsl modem/router) Email addresses use the same suffix (mydomain.com) Do not have access t (HowTos)