diff --git a/msg.go b/msg.go
index fb463c7..d644d0a 100644
--- a/msg.go
+++ b/msg.go
@@ -722,7 +722,7 @@ func (m *Msg) WriteTo(w io.Writer) (int64, error) {
 // the io.WriteTo interface but will skip the given Middleware
 func (m *Msg) WriteToSkipMiddleware(w io.Writer, mt MiddlewareType) (int64, error) {
 	var omwl, mwl []Middleware
-	copy(omwl, m.middlewares)
+	omwl = m.middlewares
 	for i := range m.middlewares {
 		if m.middlewares[i].Type() == mt {
 			continue
diff --git a/msg_test.go b/msg_test.go
index fc164d6..7fa7a05 100644
--- a/msg_test.go
+++ b/msg_test.go
@@ -1600,15 +1600,28 @@ func TestMsg_WriteToSkipMiddleware(t *testing.T) {
 	wbuf := bytes.Buffer{}
 	n, err := m.WriteToSkipMiddleware(&wbuf, "uppercase")
 	if err != nil {
-		t.Errorf("WriteTo() failed: %s", err)
+		t.Errorf("WriteToSkipMiddleware() failed: %s", err)
 		return
 	}
 	if n != int64(wbuf.Len()) {
-		t.Errorf("WriteTo() failed: expected written byte length: %d, got: %d", n, wbuf.Len())
+		t.Errorf("WriteToSkipMiddleware() failed: expected written byte length: %d, got: %d", n, wbuf.Len())
 	}
 	if !strings.Contains(wbuf.String(), "Subject: This is @ test") {
 		t.Errorf("WriteToSkipMiddleware failed. Unable to find encoded subject")
 	}
+
+	wbuf2 := bytes.Buffer{}
+	n, err = m.WriteTo(&wbuf2)
+	if err != nil {
+		t.Errorf("WriteTo() failed: %s", err)
+		return
+	}
+	if n != int64(wbuf2.Len()) {
+		t.Errorf("WriteTo() failed: expected written byte length: %d, got: %d", n, wbuf2.Len())
+	}
+	if !strings.Contains(wbuf2.String(), "Subject: THIS IS @ TEST") {
+		t.Errorf("WriteToSkipMiddleware failed. Unable to find encoded and upperchase subject")
+	}
 }
 
 // TestMsg_Write tests the Write() method of the Msg