Asp.Net发送outlook电子邮件和获取此5.7.57SMTP客户端未经过身份验证，无法在mail FROM期间发送匿名邮件

using System;
using System.Net;
using System.Net.Mail;

public class EmailSender
{
    public void SendEmail()
    {
        try
        {
            string smtpServer = "smtp.yourdomain.com";
            int smtpPort = 587;
            string smtpUsername = "yourusername";
            string smtpPassword = "yourpassword";
            string fromEmail = "from@example.com";
            string toEmail = "to@example.com";
            string subject = "Test Email";
            string body = "This is a test email.";

            SmtpClient smtpClient = new SmtpClient(smtpServer, smtpPort);
            smtpClient.EnableSsl = true;
            smtpClient.Credentials = new NetworkCredential(smtpUsername, smtpPassword);

            MailMessage mailMessage = new MailMessage(fromEmail, toEmail, subject, body);
            smtpClient.Send(mailMessage);
        }
        catch (Exception ex)
        {
            // 处理异常
        }
    }
}