System.Environment.NewLine在我的邮件中不再被识别

Question

我通过下面定义的课程发送电子邮件。这工作好几年但最近我做了一个小改动（改变了我设置主机的方式和代码中显示的端口：smtpClient.Port和smtpClient.Host）。 我不确定这是不是巧合现在我的新行不再包含在发送的消息中。  整个邮件作为一行到达。有没有人知道我怎么解决这个问题？

public class Email
    {

        private string from;

        private string to;

        private string cc = null;

        private string bcc;

        private string subject;

        private string body;

        private string displayname;


        public string From
        {
            get { return from; }
            set { from = value; }
        }

        public string To
        {
            get { return to; }
            set { to = value; }
        }

        public string Cc
        {
            get { return cc; }
            set { cc = value; }
        }

        public string Bcc
        {
            get { return bcc; }
            set { bcc = value; }
        }

        public string Subject
        {
            get { return subject; }
            set { subject = value; }
        }

        public string Body
        {
            get { return body; }
            set { body = value; }
        }

        public string DisplayName
        {
            get { return displayname; }
            set { displayname = value; }
        }

        public void Send()
        {

            MailMessage message = new MailMessage();
            message.From = new MailAddress(from);
            message.To.Add(new MailAddress(to));
            message.Body = body;
            message.Subject = subject;
            message.IsBodyHtml = true;

            if (cc != null) message.CC.Add(new MailAddress(cc));

            SmtpClient smtpClient = new SmtpClient();
            smtpClient.UseDefaultCredentials = false;
            **smtpClient.Host = smtpClient.Host;// System.Configuration.ConfigurationManager.AppSettings["SMTPHost"];
            smtpClient.Port = smtpClient.Port;// Convert.ToInt32(System.Configuration.ConfigurationManager.AppSettings["SMTPPort"]);**
            smtpClient.Send(message);






        }

以下是我发送邮件的方式：

Email message= new Email();
message.To=("me@atmytestdomain.com");
message.Subject = "test";
message.From = ("NoReply@atmytestdomain.com");
message.Body = "New line is now omitted"+System.Environment.NewLine;
message.Body += "New line is now omitted"+System.Environment.NewLine;
message.Body += "New line is now omitted"+System.Environment.NewLine;
message.Send();

提前致谢