Emails start to fail after upgraded to WordPress 3.03. Initially, I thought that the email failure only apply to Contact Form 7 (“Failed to send your message” error). In fact,  the WordPress default User email notification (after a user has signed up as a subscriber)  is also affected.

A solution (Implementing a plugin called WP Mail SMTP with a few easy steps) is found on the net which works for me providing that you’re hosting with GoDaddy on a window server.

http://angstrey.com/index.php/2009/04/22/how-to-send-e-mail-with-wordpress-from-godaddy-windows-hosting

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