使用smtp.gmail.com over http从我的网站发送电子邮件是否安全？

Question

我有以下操作方法从我的asp.net mvc-5 Web应用程序发送电子邮件，作为联系我们部分的一部分： -

[HttpPost]
public ActionResult Contact(Contact c)
{

    //
    if (ModelState.IsValid)
    {
        MailMessage mail = new MailMessage();
        mail.From = new MailAddress("****.com");
        mail.To.Add(new MailAddress("****.com"));
        mail.Subject = "New Feedback  Web Site";
        mail.IsBodyHtml = true;
        System.Text.StringBuilder mailBody = new System.Text.StringBuilder();
        mailBody.AppendLine("<b>Dear Sirs, </b><br/><br/>");
        mailBody.AppendLine(
            "New Feedback hae been submitted , with the following details :- <br/><p>" +
            "- Name : <span style='color:#78a22f'>" + c.Name + "</span><br/>" +
            "- Email : <span style='color:#78a22f'>" + c.Email + "</span><br/>" +
            "- Telephone : <span style='color:#78a22f'>" + c.Telephone + "</span><br/>"
            +
            "- Message : <span style='color:#78a22f'> " + c.Message + " </span><br/><br/></p>" +
            "<span style='font-weight:bold'>Regards</span> <br/> <span style='font-weight:bold'></span>"


            );
        // mailBody.AppendLine("<br/><br/><div style='color:#f99406;font-weight:bold'>scanning Management </div> <br/> <div style='color:#f99406;font-weight:bold'>Best Regards</div></span>");

        //System.Environment.NewLine
        mail.Body = mailBody.ToString();
        // Create a new Smpt Client using Google's servers
        var smtpClient = new SmtpClient();
        smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
        smtpClient.EnableSsl = true;
        smtpClient.Host = "smtp.gmail.com";
        smtpClient.Port = 587;

        // This is the critical part, you must enable SSL



        smtpClient.Credentials = new System.Net.NetworkCredential
             ("**@***.com", "******"); // ***use valid credentials***
        //smtp.Port = ;

        //Or your Smtp Email ID and Password
        //smtp.EnableSsl = true;
        smtpClient.Send(mail);

现在我的网站部署在http而不是https下，但在SMTPClient()我定义为使用Enable.ssl =true并且我使用的是端口587.所以我的问题是电子邮件会以安全的方式发送吗？我应该使用https而不是http联系我们吗？