This is a diff between the 0.19.0 code and my code.
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< function email_send( $p_recipient, $p_subject, $p_message, $p_header='', $p_category='', $p_exit_on_error=true ,$p_sender_email='') {

  function email_send( $p_recipient, $p_subject, $p_message, $p_header='', $p_category='', $p_exit_on_error=true ) {

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< if(!empty($p_sender_email))
< {
< $mail->From = $p_sender_email;
< }
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< if(config_is_set( 'bug_reminder_from_online_user' ) && ON == config_get( 'bug_reminder_from_online_user' ) ) {
< email_send( $t_email, $t_subject, $t_contents,'','',true,current_user_get_field( 'email' ));
< }
< else
< {
< email_send( $t_email, $t_subject, $t_contents,'','',true,'');
< }

                          email_send( $t_email, $t_subject, $t_contents );