Cannot send email with amazon ses
$this->amazon_ses->debug(TRUE);That debug-line should be used before calling ...->send(), try this and check what AmazonSES answers:
$this->load->library('amazon_ses');$this->amazon_ses->to('registered@email.com');$this->amazon_ses->subject('Open me!');$this->amazon_ses->message('<strong>Use HTML</strong>');$this->amazon_ses->debug(TRUE);print_r( $this->amazon_ses->send() );