SendMessages() public method

Sends a batch of messages through the Postmark API. All email addresses must be valid, and the sender must be a valid sender signature according to Postmark. To obtain a valid sender signature, log in to Postmark and navigate to: http://postmarkapp.com/signatures.
public SendMessages ( ) : IEnumerable
return IEnumerable
        public void Can_send_batched_messages()
        {
            var postmark = new PostmarkClient(_serverToken);

            var first = new PostmarkMessage
            {
                To = _to,
                From = _from, // This must be a verified sender signature
                Subject = Subject,
                TextBody = TextBody + " one"
            };
            var second = new PostmarkMessage
            {
                To = _to,
                From = _from, // This must be a verified sender signature
                Subject = Subject,
                TextBody = TextBody + " two"
            };

            var responses = postmark.SendMessages(first, second);
            Assert.AreEqual(2, responses.Count());

            foreach (var response in responses)
            {
                Assert.IsNotNull(response);
                Assert.IsNotNullOrEmpty(response.Message);
                Assert.IsTrue(response.Status == PostmarkStatus.Success);
                Console.WriteLine("Postmark -> " + response.Message);
            }
        }