如何通过Gmail使用C＃发送电子邮件 [英] How to send an e-mail with C# through Gmail

问题描述

我试图通过我的网络服务发送电子邮件时出现错误。我曾尝试启用对安全性较低的应用的访问权限，禁用两步验证并通过网络浏览器登录帐户。 SO上的解决方案都没有为我工作。我仍然收到：

错误：System.Net.Mail.SmtpException：SMTP服务器需要
安全连接或客户端未通过身份验证。服务器
的响应是：5.5.1需要身份验证。

我该如何解决这个问题？

  namespace EmailService 
 {
 public class Service1：IService1 
 {
 public string SendEmail（ string inputEmail，string subject，string body）
 {
 string returnString =; 
尝试
 {
 MailMessage email = new MailMessage（）; 
 SmtpClient smtp = new SmtpClient（）; 
 smtp.Host =smtp.gmail.com; 
 
 //设置Gmail服务器
 smtp.EnableSsl = true; 
 smtp.Port = 587; 
 smtp.Credentials = new System.Net.NetworkCredential（[e-mail]，mypassword）; 
 smtp.DeliveryMethod = SmtpDeliveryMethod.Network; 
 smtp.UseDefaultCredentials = false; 
 
 //起草电子邮件
 MailAddress fromAddress = new MailAddress（[e-mail]）; 
 email.From = fromAddress; 
 email.To.Add（inputEmail）; 
 email.Subject = body; 
 email.Body = body; 
 
 smtp.Send（email）; 
 
 returnString =成功！请检查您的电子邮件。; 
 
 catch（Exception ex）
 {
 returnString =Error：+ ex.ToString（）; 
} 
 return returnString; 
 
 
 
  

解决方案

只需转到此处：安全性较低的应用程序，使用用于发送邮件的电子邮件和密码登录在您的C＃代码中，并选择打开。

另请点击此链接并点击继续 允许访问您的Google帐户

我也编辑一点：

  public string sendit（string ReciverMail）
 {
 MailMessage msg = new MailMessage （）; 
 
 msg.From =新邮件地址（[e-mail]）; 
 msg.To.Add（ReciverMail）; 
 msg.Subject =Hello world！+ DateTime.Now.ToString（）; 
 msg.Body =你...... :); 
 SmtpClient client = new SmtpClient（）; 
 client.UseDefaultCredentials = true; 
 client.Host =smtp.gmail.com; 
 client.Port = 587; 
 client.EnableSsl = true; 
 client.DeliveryMethod = SmtpDeliveryMethod.Network; 
 client.Credentials = new NetworkCredential（[e-mail]，YourPassword）; 
 client.Timeout = 20000; 
尝试
 {
 client.Send（msg）; 
返回邮件已成功发送！; 
} 
 catch（Exception ex）
 {
 returnFail Has error+ ex.Message; 
} 
 finally 
 {
 msg.Dispose（）; 
 
 
 
 
 $ b 
如果上述代码不起作用，请尝试像下面的代码一样改变它：
  SmtpClient client = new SmtpClient（）; 
 client.Host =smtp.gmail.com; 
 client.Port = 587; 
 client.EnableSsl = true; 
 client.DeliveryMethod = SmtpDeliveryMethod.Network; 
 client.UseDefaultCredentials = false; 
 client.Credentials = new NetworkCredential（[e-mail]，YourPassword）; 
  
 
I am getting an error when trying to send an e-mail through my web service. I have tried enabling access to less secure apps disabling 2-step verification and logging into the account via a web browser. None of the solutions on SO have worked for me. I am still getting:

  
Error: System.Net.Mail.SmtpException: The SMTP server requires a
  secure connection or the client was not authenticated. The server
  response was: 5.5.1 Authentication Required.
What can I do to fix this issue?
namespace EmailService
{
    public class Service1 : IService1
    {    
        public string SendEmail(string inputEmail, string subject, string body)
        {
            string returnString = "";
            try
            {
                MailMessage email = new MailMessage();
                SmtpClient smtp = new SmtpClient();
                smtp.Host = "smtp.gmail.com";

                // set up the Gmail server
                smtp.EnableSsl = true;
                smtp.Port = 587;
                smtp.Credentials = new System.Net.NetworkCredential("[e-mail]", "mypassword");
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtp.UseDefaultCredentials = false;

                // draft the email
                MailAddress fromAddress = new MailAddress("[e-mail]");
                email.From = fromAddress;
                email.To.Add(inputEmail);
                email.Subject = body;
                email.Body = body;

                smtp.Send(email);

                returnString = "Success! Please check your e-mail.";
            }
            catch(Exception ex)
            {
                returnString = "Error: " + ex.ToString();
            }
            return returnString;
        }
    }
}

解决方案
Just  Go here : Less secure apps , Log on using your Email and Password which use for sending mail in your c# code , and choose Turn On.

Also please go to this link and click on Continue Allow access to your Google account 

also I edit it little bit :
public string sendit(string ReciverMail)
{
    MailMessage msg = new MailMessage();

    msg.From = new MailAddress("[e-mail]");
    msg.To.Add(ReciverMail);
    msg.Subject = "Hello world! " + DateTime.Now.ToString();
    msg.Body = "hi to you ... :)";
    SmtpClient client = new SmtpClient();
    client.UseDefaultCredentials = true;
    client.Host = "smtp.gmail.com";
    client.Port = 587;
    client.EnableSsl = true;
    client.DeliveryMethod = SmtpDeliveryMethod.Network;
    client.Credentials = new NetworkCredential("[e-mail]", "YourPassword");
    client.Timeout = 20000;
    try
    {
       client.Send(msg);
        return "Mail has been successfully sent!";
    }
    catch (Exception ex)
    {
        return "Fail Has error" + ex.Message;
    }
    finally
    {
       msg.Dispose();
    }
}
If the above code don't work , try to change it like the following code :
    SmtpClient client = new SmtpClient();
    client.Host = "smtp.gmail.com";
    client.Port = 587;
    client.EnableSsl = true;
    client.DeliveryMethod = SmtpDeliveryMethod.Network;
    client.UseDefaultCredentials = false;
    client.Credentials = new NetworkCredential("[e-mail]", "YourPassword");


                        
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