If mails are not going out problem is with mail server, some time mail server get black listed. If a php mail script works on the server, mail from vshare will also work. Mostly it is server related issue.

To send mails with smtp, you need to edit include/phpmailer/class.phpmailer.php and set SMTP server details in it.

Some of the changes are

Code:
public $Mailer            = 'mail';
change mail to smtp.

Other related settins are under PROPERTIES FOR SMTP in the file.