SMTP服务器要求安全连接或客户端未通过身份验证。服务器响应为：5.5.1需要验证 [英] The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required

问题描述

我有一个问题，当IM通过这个代码，那么错误发生在发送邮件SMTP服务器要求安全连接或客户端未通过身份验证服务器响应为：5.5.1需要身份验证

和我的代码是：

 保护无效ImageButton1_Click（对象发件人，ImageClickEventArgs E）
 {
 
邮件MAILMESSAGE新= MAILMESSAGE（）; 
 mail.To.Add（[e-mail]）; 
 mail.From =新的MailAddress（[e-mail]）; 
绳体=<表>< TR>< TD>公司名称：< / TD>< TD>中+ txt_cname.Text +&下; / TD>&下; / TR>&下; TR>&下; TD>地址随着No.:</td><td> + txt_addwithno.Text +< / TD>< / TR>< TR>< TD>联系人：< / TD>< TD>中+ txt_conperson.Text +< / TD>< / TR>< TR>< TD>电子邮件ID< / TD>< TD>中+ txt_email.Text +< / TD>< / TR>< TR>< TD>简介< / TD>< TD>中+ txt_description.Text +< / TD>< / TR>< /表>， 
 mail.Body =身体; 
 mail.IsBodyHtml = TRUE; 
 SmtpClient SMTP =新SmtpClient（）; 
 smtp.Host =smtp.gmail.com; 
 smtp.Port = 25; 
 smtp.UseDefaultCredentials = TRUE; 
 smtp.Credentials =新System.Net.NetworkCredential（[e-mail]，XYZ）; 
 smtp.EnableSsl = TRUE; 
 smtp.Send（邮件）; 
 
 
 txt_cname.Focus（）; 
 txt_cname.Text =; 
 txt_addwithno.Text =; 
 txt_conperson.Text =; 
 txt_email.Text =; 
 txt_description.Text =; 
 
} 
  

解决方案

谷歌可能阻止应用程序访问您的帐户

在这里，您可以使应用程序与你的凭证来访问谷歌帐户：

的https://accounts.google.com/DisplayUnlockCaptcha

I have a Problem, when i m sending a mail through this code then error is occured that "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. "

and my code is :

protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{

    MailMessage mail = new MailMessage();
    mail.To.Add("[e-mail]");
    mail.From = new MailAddress("[e-mail]");
    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("[e-mail]", "xyz");
    smtp.EnableSsl = true;
    smtp.Send(mail);


    txt_cname.Focus();
    txt_cname.Text = "";
    txt_addwithno.Text = "";
    txt_conperson.Text = "";
    txt_email.Text = "";
    txt_description.Text = "";

}

解决方案

Google may prevent an application from accessing your account
Here you can enable applications to access google account with your credentials:

https://accounts.google.com/DisplayUnlockCaptcha

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