Fixing issue where original textproto.Error wasn't properly returned …

…from Send()

send.go

@@ -35,12 +35,11 @@ func (f SendFunc) Send(from string, to []string, msg io.WriterTo) error {
 
 // Send sends emails using the given Sender.
 func Send(s Sender, msg ...*Message) error {
-	for i, m := range msg {
+	for _, m := range msg {
 		if err := send(s, m); err != nil {
-			return fmt.Errorf("gomail: could not send email %d: %v", i+1, err)
+			return err
 		}
 	}
-
 	return nil
 }
 

send_test.go

@@ -3,6 +3,7 @@ package gomail
 import (
 	"bytes"
 	"io"
+	"net/textproto"
 	"reflect"
 	"testing"
 )
@@ -59,6 +60,30 @@ func TestSend(t *testing.T) {
 	}
 }
 
+func TestSendError(t *testing.T) {
+	expected := &textproto.Error{
+		Code: 400,
+		Msg:  "Error",
+	}
+
+	s := &mockSendCloser{
+		mockSender: func(from string, to []string, msg io.WriterTo) error {
+			return expected
+		},
+	}
+	err := Send(s, getTestMessage())
+	if err == nil {
+		t.Errorf("Expected error in Send(): %v", err)
+	}
+	if got, ok := err.(*textproto.Error); ok {
+		if !reflect.DeepEqual(got, expected) {
+			t.Errorf("Invalid error received in Send(). Expected %v Got %v", expected, got)
+		}
+	} else {
+		t.Errorf("Invalid error type in Send(): %v", err)
+	}
+}
+
 func getTestMessage() *Message {
 	m := NewMessage()
 	m.SetHeader("From", testFrom)