SMTP 设置使连接超时

问：

我添加了从联系表单中获取响应并将其发送到我提供的电子邮件的功能，然后再次将电子邮件发送给感谢客户，但是当我尝试发送电子邮件时，它花费了太多时间，例如 2 分钟，最后它向我显示连接已超时。作为初学者，这是我添加此类功能的第一个项目，所以请帮助我如何克服这个问题？

using BlueDot_Website.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Mail;
using System.Web;
using System.Web.Mvc;

namespace BlueDot_Website.Controllers
{
    public class ContactController : Controller
    {
        [HttpPost]
        public ActionResult SendEmail(ContactViewModel model)
        {
            // Send email to business email address
            SendBusinessEmail(model);

            // Send thank you email to the customer
            SendThankYouEmail(model);

            // Optionally, you can return a different view to display a confirmation message
            return RedirectToAction("Index", "Home");
        }

        private void SendBusinessEmail(ContactViewModel model)
        {
            MailMessage message = new MailMessage();
            message.From = new MailAddress("[email protected]"); // Replace with your business email address
            message.To.Add("[email protected]"); // Replace with your business email address
            message.Subject = "New Contact Form Submission";
            message.Body = $"Name: {model.Name}\r\nEmail: {model.Email}\r\nContact Number: {model.ContactNumber}\r\nCompany: {model.Company}\r\nAddress: {model.Address}\r\nCity: {model.City}\r\nCountry: {model.Country}\r\nSubject: {model.Subject}\r\nMessage: {model.Message}";

            // Configure your SMTP settings
            string smtpServer = "mail.bluedotme.com";
            int smtpPort = 465; // Change to the appropriate port for your SMTP server
            string username = "[email protected]"; // Replace with your email address
            string password = "*********"; // Replace with your email password

            // Create an instance of SmtpClient
            using (SmtpClient smtpClient = new SmtpClient(smtpServer, smtpPort))
            {
                smtpClient.EnableSsl = true; // Enable SSL/TLS
                smtpClient.UseDefaultCredentials = false; // Disable default credentials

                // Set your authentication details
                smtpClient.Credentials = new NetworkCredential(username, password);

                // Send the email
                smtpClient.Send(message);
            }
        }


        private void SendThankYouEmail(ContactViewModel model)
        {
            MailMessage message = new MailMessage();
            message.From = new MailAddress("[email protected]"); // Replace with your business email address
            message.To.Add(model.Email);
            message.Subject = "Thank You for Contacting Us";
            message.Body = "Thank you for contacting us. We will get back to you soon.";

           // Configure your SMTP settings
            string smtpServer = "smtpout.secureserver.net";
            int smtpPort = 465; // Change to the appropriate port for your SMTP server
            string username = "[email protected]"; // Replace with your email address
            string password = "*********"; // Replace with your email password

            // Create an instance of SmtpClient
            using (SmtpClient smtpClient = new SmtpClient(smtpServer, smtpPort))
            {
                smtpClient.EnableSsl = true; // Enable SSL/TLS
                smtpClient.UseDefaultCredentials = false; // Disable default credentials

                // Set your authentication details
                smtpClient.Credentials = new NetworkCredential(username, password);

                // Send the email
                smtpClient.Send(message);
            }
        }
    }
}

我添加了端口设置如下：

Outgoing Server:mail.bluedotme.com
SMTP Port: 465

请让我知道我如何克服这样的问题？

我试图像已经发布的回复一样做到最好，但我仍然无法弄清楚问题所在