无法发送电子邮件 - 错误：SMTP服务器需要安全连接或客户端未经过身份验证。服务器响应为：5.5.1需要身份验证。了解更多信息 [英] Could not send the e-mail - error: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at

问题描述

protected void Button1_Click(object sender, EventArgs e)
    {
  try
     {
         SmtpClient smtp= new SmtpClient("smtp.gmail.com", 587);
         smtp.EnableSsl = true;
         smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
         smtp.UseDefaultCredentials = false;
         smtp.Credentials = new System.Net.NetworkCredential("[e-mail]", "password");
         smtp.Timeout = 30000;

       MailMessage message = new MailMessage();
       message.To.Add("[e-mail]");
       message.From = new MailAddress("[e-mail]");
       message.Subject = "Test Mail";
       message.Body = "This is for testing SMTP mail from GMAIL";
         smtp.Send(message);
         Response.Write("E-mail sent!");
     }
                                
        catch (Exception ex)
        {
            Response.Write("Could not send the e-mail - error: " + ex.Message);
        }
    }

推荐答案

确保用户名和密码在行中正确无误：

Make sure the username and password is correct in the line:

smtp.Credentials = new System.Net.NetworkCredential("[e-mail]", "password");

尝试评论该行：

try commenting the line :

smtp.UseDefaultCredentials = false;

还尝试在构造函数外部设置属性：

Also try setting the properties outside the constructor:

smtp.Host = "smtp.gmail.com";
smtp.Port = 587;

按照以下步骤检查解决方案1 ​​。



1） https://accounts.google.com/DisplayUnlockCaptcha [ ^ ] //点击允许访问您的Google帐户



2）你必须为你的谷歌帐户启用从其他时区/ IP登录。



这样做是按照链接 https://g.co/allowaccess [ ^ ]并允许通过单击继续按钮进行访问。



3）转到以下链接的安全设置 https://www.google.com/ settings / security / lesssecureapps [ ^ ]和启用不太安全的应用。这样您就可以从所有应用程序登录。

Hi,

Check the solution 1 after follow this below steps.

1) https://accounts.google.com/DisplayUnlockCaptcha[^] //Click allow access to your Google account

2) You have to enable login from other timezone / ip for your google account.

to do this follow the link https://g.co/allowaccess[^] and allow access by clicking the continue button.

3) go to security settings at the followig link https://www.google.com/settings/security/lesssecureapps[^] and enable less secure apps . So that you will be able to login from all apps.

这篇关于无法发送电子邮件 - 错误：SMTP服务器需要安全连接或客户端未经过身份验证。服务器响应为：5.5.1需要身份验证。了解更多信息的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！