SMTP服务器需要安全连接，或者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.?8 [英] The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.?8

问题描述

我正在使用c#创建示例电子邮件发件人，但显示错误为:

I was create sample email sender using c# but it shows an error is:

SMTP服务器需要安全连接，或者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.

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

        System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
        mail.To.Add("[e-mail]");
        mail.From = new MailAddress("[e-mail]", "Test Mail !", System.Text.Encoding.UTF8);
        mail.Subject = "Test Mail";
        mail.SubjectEncoding = System.Text.Encoding.UTF8;
        mail.Body = "Test message";
        mail.BodyEncoding = System.Text.Encoding.UTF8;
        mail.IsBodyHtml = true;
        mail.Priority = MailPriority.High;
        SmtpClient client = new SmtpClient();
        client.Credentials = new System.Net.NetworkCredential("[e-mail]", "password");
        client.Port = 587;
        client.Host = "smtp.gmail.com";
        client.EnableSsl = true;
        client.UseDefaultCredentials = true;
        client.Send(mail);

Web配置:

<system.net>
    <mailSettings>
      <smtp from="[e-mail]">
        <network host="smtp.gmail.com" password="password"
          port="587" userName="[e-mail]" />
      </smtp>
    </mailSettings>
</system.net>

推荐答案

如果启用了双重身份验证，则需要为自己的Google帐户生成一个应用密码.

If you have two-factor authentication enabled, you will need to generate yourself an App Password for your Google account.

生成此类密码的步骤如下( [Google页面] | [已归档页面] ):

The steps for generating such password are as follows ( [Google page] | [Archived page]):

1. 访问您的应用密码页面.可能会要求您登录到您的Google帐户.
2. 在底部，单击选择应用程序"，然后选择您正在使用的应用程序.
3. 点击选择设备，然后选择您正在使用的设备.

1. Visit your App passwords page. You may be asked to sign in to your Google Account.
2. At the bottom, click Select app and choose the app you’re using.
3. Click Select device and choose the device you’re using.

1. 点击生成.
2. 按照说明在设备上输入应用密码(黄色栏中的16个字符代码).

1. 点击完成.

点击完成后，您将不会再看到该应用的密码. 但是，您将看到已创建的应用程序和设备的列表 的密码.

Once you click done, you’ll won’t see that App password code again. However, you will see a list of apps and devices you’ve created App passwords for.

然后，在您的NetworkCredentials中，将密码替换为生成的16位密码.

Then, in your NetworkCredentials, replace your password with the generated 16-digit passcode.

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