Send SMTP Email through Exchange Server Using Zend_Mail - How to Diagnose these Errors - zend-framework

Question

I have the following code:
$config = array(
'auth' => 'login',
'username' => 'domain\user',
'password' => 'password',
'ssl' => 'tls',
'port' => 25,
);
$tr = new Zend_Mail_Transport_Smtp('192.168.101.11',$config);
Zend_Mail::setDefaultTransport($tr);
$mail = new Zend_Mail();
$mail->setBodyText($text);
$mail->setFrom('noreply#domain.com');
$mail->addTo($user->getEmail());
$mail->setSubject('Email subject');
$mail->send();
When I try to connect using what should be the correct credentials I get the following error in the log:
2010-10-12T13:00:59-07:00 ERR (3): AdminController::emailPassword - 5.7.1
2010-10-12T13:00:59-07:00 ERR (3): AdminController::emailPassword - #0 /usr/share/php/Zend/Mail/Protocol/Smtp.php(261): Zend_Mail_Protocol_Abstract->_expect(250, 300)
#1 /usr/share/php/Zend/Mail/Transport/Smtp.php(207): Zend_Mail_Protocol_Smtp->mail('noreply#domain...')
#2 /usr/share/php/Zend/Mail/Transport/Abstract.php(348): Zend_Mail_Transport_Smtp->_sendMail()
#3 /usr/share/php/Zend/Mail.php(1178): Zend_Mail_Transport_Abstract->send(Object(Zend_Mail))
...
When I try to connect and send an email using a definitely bad password I get the following error:
2010-10-12T13:03:52-07:00 ERR (3): AdminController::emailPassword - 5.7.3
2010-10-12T13:03:52-07:00 ERR (3): AdminController::emailPassword - #0 /usr/share/php/Zend/Mail/Protocol/Smtp/Auth/Login.php(95): Zend_Mail_Protocol_Abstract->_expect(235)
#1 /usr/share/php/Zend/Mail/Protocol/Smtp.php(217): Zend_Mail_Protocol_Smtp_Auth_Login->auth()
#2 /usr/share/php/Zend/Mail/Transport/Smtp.php(200): Zend_Mail_Protocol_Smtp->helo('localhost')
#3 /usr/share/php/Zend/Mail/Transport/Abstract.php(348): Zend_Mail_Transport_Smtp->_sendMail()
#4 /usr/share/php/Zend/Mail.php(1178): Zend_Mail_Transport_Abstract->send(Object(Zend_Mail))
#5 /var/www/mreserve/application/controllers/AdminController.php(458): Zend_Mail->send()
...
My problem, I don't really know how to diagnose these errors. Where do I look up what 5.7.1 and 5.7.3 error codes are described, etc? Google wasn't helping me too much. When I plug in the credentials for my personal GMail account I am able to send mail just fine, so I know that I can send emails when configured correctly.
A few other possibly helpful tidbits, I am trying to send from a company Exchange that has created an email account for this user, I am trying to send to an email outside of the domain, and I don't have a lot of access to the exchange server- other than a few screenshots on how they set up their email clients.

Answer 1

These are NDR (Non Delivery Report) codes for Exchange server.
Here is a (rather old) blog entry describing them, and another page listing the sames codes for exchange 2007.
5.7.1 Error code
"permission problem", which could point to a:
a SMTP relay problem. Your account is not authorized to send emails to another domain.
a sender/receiver problem. Your account is not authorized to send emails to a discussion list (because your account is not a member of it)
other specific restrictions on your account.
IMHO, only the SMTP logs can tell the exact cause.
5.7.3 Error code
"sender prohibited" or "Not Authorized, security problem", depending on the source; could be consistent with wrong password submission.
Hope this helps.