Since PHP mail() function has disabled on some servers, you might not be able to send and receive emails directly through WordPress or Joomla. In that case, please following below steps
1. Create email account from your cpanel to use as outgoing email id. Example, if your domain is xyz.com, you can create email like info@xyz.com
2. Specify credentials of created email account under outgoing email configuration of your CMS.
In WordPress, you can use one of below plugins,
http://wordpress.org/extend/plugins/wp-mail-smtp/
In Joomla, SMTP authentication supported by default. http://help.joomla.org/content/view/51/153/1/7/