private void SendEmail(EmailMessage email)
 {
     Console.WriteLine($"Sending email to {email.ToAddress}");
     _emailGateway.Send(email);
     _emails.Remove(email);
 }
        public string SendOne(EmailMessage emailMessage)
        {
            SendEmail(emailMessage);

            return("The call was successful.");
        }
 public void Add(EmailMessage email)
 {
     _emails.Add(email);
 }