SMTP auth support can be added in wordpress through third party plugins. You can follow these steps to add SMTP authentication to your wordpress install
1) Download http://www.callum-macdonald.com/download/wp_mail_smtp.zip 2) Unzip the file to get the file named wp_mail_smtp.php 3) Copy the file to the plugins folder (\wordpress\wp-content\plugins) 4) Login to wordpress as admin and click on plugins you can see WP-Mail-SMTP Activate it. 5) Click on options->E-mail to Modify the SMTP settings 6) modify the following fields
* Specify the from name and email address created under your domain) * Choose to send mail by SMTP * Specify an SMTP host (mail.domainname). * Choose to use SMTP authentication or not (yes). * Specify an SMTP username and password.(specify one valid email ID/pass) Once you finish. Click on update options.
7) Test the mail function from there using " send Test"
