相关疑难解决方法(0)

我有一个问题,当我通过此代码发送邮件时,出现错误"SMTP服务器需要安全连接或客户端未经过身份验证.服务器响应是:5.5.1需要身份验证."

我的代码是:

protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{

    MailMessage mail = new MailMessage();
    mail.To.Add("info@msslindia.com");
    mail.From = new MailAddress("info@msslindia.com");
    string body = "<table><tr><td>Company Name:</td><td>" + txt_cname.Text + "</td></tr><tr><td>Address With No.:</td><td>" + txt_addwithno.Text + "</td></tr><tr><td>Contact Person:</td><td>" + txt_conperson.Text + "</td></tr><tr><td>Email Id</td><td>" + txt_email.Text + "</td></tr><tr><td>Description</td><td>" + txt_description.Text + "</td></tr></table>";
    mail.Body = body;
    mail.IsBodyHtml = true;
    SmtpClient smtp = new SmtpClient();
    smtp.Host = "smtp.gmail.com";
    smtp.Port = 25;
    smtp.UseDefaultCredentials = true;
    smtp.Credentials = new System.Net.NetworkCredential("info@msslindia.com", "xyz");
    smtp.EnableSsl = true;
    smtp.Send(mail);


    txt_cname.Focus();
    txt_cname.Text = …