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 the zip from "http://www.callum-macdonald.com/download/wp_mail_smtp.zip".

2) Now, unzip the file and get the file named "wp_mail_smtp.php".

3) Copy the file to the folder - Plugins "\wordpress\wp-content\plugins".

4) Login to wordpress as "admin" and click on plugins you will see WP-Mail-SMTP

5) Click on Options->E-mail to Modify the SMTP settings

6) modify the following fields

* Specify - from the 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".

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