PHP Sendmail not Working to External Addresses

[joelrob]

We have a PHP script utilizing sendmail to send e-mails to internal and external e-mail addresses. The script worked fine with Exchange 2003. Now that we've implemented Exchange 2007, the script can still send mail to the internal addresses, local.user@mydomain.com, but can't sent to any external addresses remote.user@msn.com.

The error on the webpage with the script is:

Mailer Error: Language string failed to load: recipients_failed{external.email@msn.com}

Nothing in the event logs from Exchange server. The machine has not been granted access because the script uses SMTP authentication with an AD user name/password.

The script is running on a Windows 2003 server with PHP and Apache. The mail server it's sending to is on Windows 2003 server with Exchange 2007.

Anyone else run into the same thing and found a fix?

Thanks in advance.

 

[ingresman]

try

http://www.u-g-h.com/index.php/2007/04/27/phpmailer-issue-on-iis/