configuring a mail server to use an external mail server
 

Hi,
I have a server with a php website on it.
in my website i have a contact us page that get messages from users.

i installed a sendmail on my server, but i want this mail server use an external mail server : mail.site.com
what can i do ? and what step should i go to send email to this server?

which configurations in php.ini and which in sendmail.cf?
thanks

check the SMART_HOST directive - http://www.dnsexit.com/support/mailrelay/sendmail.html