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PHP sendmail Authentication to Exchange 2007?

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Last Modified: 2013-12-13
I can send emails from my Windows server 2003R2 w/IIS6 w/PHP5 to my Exchange 2007 server - but to internal email addresses only.  

External addresses fail to send.as follows:

... SERVER: 550 5.7.1 Unable to relay SMTP -> ERROR: RCPT not accepted from server: 550 5.7.1  ...(more partial copy of the error is below)

-> get_lines(): $data was "" SMTP -> get_lines(): $str is "504 5.7.4 Unrecognized authentication type " SMTP -> get_lines(): $data is "504 5.7.4 Unrecognized authentication type " SMTP -> ERROR: AUTH not accepted from server: 504 5.7.4 Unrecognized authentication type SMTP -> get_lines(): $data was "" SMTP -> get_lines(): $str is "250 2.0.0 Resetting " SMTP -> get_lines(): $data is "250 2.0.0 Resetting " SMTP -> FROM SERVER: 250 2.0.0 Resetting SMTP -> get_lines(): $data was "" SMTP -> get_lines(): $str is "250 2.1.0 Sender OK " SMTP -> get_lines(): $data is "250 2.1.0 Sender OK " SMTP -> FROM SERVER: 250 2.1.0 Sender OK SMTP -> get_lines(): $data was "" SMTP -> get_lines(): $str is "550 5.7.1 Unable to relay " SMTP -> get_lines(): $data is "550 5.7.1 Unable to relay " SMTP -> FROM SERVER: 550 5.7.1 Unable to relay SMTP -> ERROR: RCPT not accepted from server: 550 5.7.1 Unable to relay SMTP -> get_lines(): $data was "" SMTP -> get_lines(): $str is "250 2.0.0 Resetting " SMTP -> get_lines(): $data is "250 2.0.0 Resetting " SMTP -> FROM SERVER: 250 2.0.0 Resetting Error sending: Language string failed to load: recipients_failedoutsideemail@anydomain.net

What is the right PHP code to have the Exchange server accept the email and RELAY it using an AD/Exchange user account name/password?  

& where do I enter it?

in the PHP.ini or the class.phpmailer.php or somewhere else?
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