diff --git a/booking.helper.inc b/booking.helper.inc
index 9a37c03..e6eec81 100644
--- a/booking.helper.inc
+++ b/booking.helper.inc
@@ -6,18 +6,23 @@
  */
 function _valid_email_address($email) {
 	//firstly use the built-in function to validate the format
-	if (! valid_email_address($email))
+	if (! valid_email_address($email)) {
+		watchdog('booking', "Drupal validation of email address '!email' returns false.", array('!email' => $email));
 	  return false;
+	}
 	//now check the domain exists
 
   if (preg_match('/^(.*?)\@(.*)/', $email, $matches)) {
-    //watchdog('booking', 'Email address checking: @info', array('@info' => var_export($matches, TRUE)));
-	if (! checkdnsrr($matches[2], "MX"))
-	  return 0;
-	return 1;
+		//watchdog('booking', 'Email address checking: @info', array('@info' => var_export($matches, TRUE)));
+		if (! checkdnsrr($matches[2], "MX")) {
+			watchdog('booking', "No valid MX record found for email address '!email' with domain name !domain", array('!email' => $email, '!domain' => $matches[2]));
+			return false;			
+		}
+		return true;
   }
+	watchdog('booking', "Regular expression failed to detect domain portion of email address '!email'", array('!email' => $email));
   //watchdog('booking', 'Email address checking doesnt match');
-  return 0;
+  return false;
 }
 
 /**
diff --git a/booking.paypal.inc b/booking.paypal.inc
index 8793df3..b3cfdcd 100644
--- a/booking.paypal.inc
+++ b/booking.paypal.inc
@@ -14,7 +14,7 @@ function _booking_paypal_post($data = array()) {
 function _booking_paypal_ipn_verify($vars = array()) {
 
   if (variable_get('booking_paypal_sandbox', 0)) {
-	watchdog('booking', 'Setting IPN verify to true, running in sandbox mode');
+		watchdog('booking', 'Setting IPN verify to true, running in sandbox mode');
     // PayPal sandbox requires login in order to even access, so for sandbox mode, simply return true.
     return TRUE;
   }