diff --git a/lib/Qpsmtpd/Auth.pm b/lib/Qpsmtpd/Auth.pm
index 635491a..993c176 100644
--- a/lib/Qpsmtpd/Auth.pm
+++ b/lib/Qpsmtpd/Auth.pm
@@ -42,7 +42,7 @@ sub SASL {
           $session->respond(334, e64("Username:"));
           $user = decode_base64(<STDIN>);
           if ($user eq '*') {
-            $session->respond(501, "Authentification canceled");
+            $session->respond(501, "Authentication canceled");
             return DECLINED;
           }
         }
@@ -51,7 +51,7 @@ sub SASL {
         $passClear = <STDIN>;
         $passClear = decode_base64($passClear);
         if ($passClear eq '*') {
-          $session->respond(501, "Authentification canceled");
+          $session->respond(501, "Authentication canceled");
           return DECLINED;
         }
     }
@@ -68,7 +68,7 @@ sub SASL {
         my $line = <STDIN>;
 
         if ( $line eq '*' ) {
-            $session->respond( 501, "Authentification canceled" );
+            $session->respond( 501, "Authentication canceled" );
             return DECLINED;
         }
 
@@ -82,7 +82,7 @@ sub SASL {
 
     # Make sure that we have enough information to proceed
     unless ( $user && ($passClear || $passHash) ) {
-      $session->respond(504, "Invalid authentification string");
+      $session->respond(504, "Invalid authentication string");
       return DECLINED;
     }