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Sent SMTP message to Exchange server through external web server

scrmcna asked
Last Modified: 2012-05-25
We are developing a new website that has a feature where they can filll out a form on our website and submit it to an e-mail address on our exchange 2003 server.  It's an Expression Engine using Php on the website.  The website is sitting on our DMZ and I have opened port 25 to go from the webserver to the exchange server.  I can telnet mailserver 25 but I get a -0500 code at the end of my telnet.  Is that an authentication issue?  Regardless, I can't get an e-mail message to go through.  On the Expression Engine side, I entered a user I setup in AD, with an e-mail account to send through.  I have set that user Relay privledges on SMTP in exchange.  Not sure what else to look at.
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