发送邮件时出现异常 [英] Exception while sending mail

问题描述

我发送邮件的代码如下：

 使用系统; 
 使用 System.Collections.Generic; 
 使用 System.Linq; 
 使用 System.Web; 
 使用 System.Web.UI; 
 使用 System.Web.UI.WebControls; 
 使用 System.Data.SqlClient; 
 使用 System.Net; 
 使用 System.Net.Mail; 
 
  public   partial   class  _Default：System.Web.UI.Page 
 {
 
  protected   void  Page_Load（ object  sender，EventArgs e）
 {
 
} 
  protected   void  Button1_Click1（ object  sender，EventArgs e）
 {
 尝试 
 {
  var  fromaddress =   [e-mail];  //  发件人地址 
  const   string  password =   aaaaaaaaaa ;  //  发件人密码;  
  var  toaddress = TextBox2.Text;  //  收件人地址 
  string  content; 
 content =   Hiii这是一个例子 + TextBox1.Text +  谢谢; 
  //   smtp setting  
 SmtpClient cl = 新 SmtpClient（）; 
 cl.Host =   smtp.gmail.com; 
 cl.Port =  587 ;  //  端口号发送邮件 
 cl.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod 。网络; 
 cl.Credentials =  new  NetworkCredential（fromaddress，password）; 
  //   cl.Timeout = 2000;  
  //  设置结束 
 cl.Send（fromaddress，toaddress，TextBox3.Text，content）; 
} 
  catch （例外情况）
 {
 Response.Write（ex）; 
} 
} 
} 

运行此代码我收到的错误是

 System.Net.Mail.SmtpException：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 。 7 。 0 必须首先发出STARTTLS命令。 ab1sm20519532pbd。 37   -  System.Net.Mail.MailCommand.CheckResponse上的gsmtp（SmtpStatusCode statusCode， String 响应）在System.Net.Mail.MailCommand.Send（SmtpConnection conn， Byte  []命令， String   String  deliveryNotify，SmtpFailedRecipientException& System.Net.Mail.SmtpClient.Send（ String  来自，字符串收件人，字符串主题， String  body位于_Default.Button1_Click1（对象发​​件人， EventArgs e）在 f：\ Training\Shopping\Default.aspx.cs：line  35  

尽快回复 。

谢谢。

解决方案

你错过了一行。

 client.UseDefaultCredentials =  false ; 
 client.EnableSsl =  true ;  //   Gmail适用于服务器安全层 

并确保您的Gmail用户名和密码正确无误。



查看我的答案从asp.net发送电子邮件到gmail [ ^ ]。



感谢...

My code for sending mail is as follow

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Net;
using System.Net.Mail;

public partial class _Default : System.Web.UI.Page
{
  
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click1(object sender, EventArgs e)
    {
        try
        {
            var fromaddress = "[e-mail]";  //address of sender
            const string password = "aaaaaaaaaa";                    //password of sender;
            var toaddress = TextBox2.Text;                  //address of reciever
            string content;
            content = "Hiii this is a example" + TextBox1.Text + " Thank you";
            //smtp setting
            SmtpClient cl = new SmtpClient();
            cl.Host = "smtp.gmail.com";
            cl.Port = 587;      //port no to send mail
            cl.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
            cl.Credentials = new NetworkCredential(fromaddress, password);
            //cl.Timeout = 2000;
            //setting end
            cl.Send(fromaddress, toaddress, TextBox3.Text, content);
        }
        catch (Exception ex)
        {
            Response.Write(ex);
        }
    }
}

while running this code I am getting the error as

System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. ab1sm20519532pbd.37 - gsmtp at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response) at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from) at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) at System.Net.Mail.SmtpClient.Send(MailMessage message) at System.Net.Mail.SmtpClient.Send(String from, String recipients, String subject, String body) at _Default.Button1_Click1(Object sender, EventArgs e) in f:\Training\Shopping\Default.aspx.cs:line 35

Reply as fast as possible.
Thank you.

解决方案

You have missed lines.

client.UseDefaultCredentials = false;
client.EnableSsl = true; //Gmail works on Server Secured Layer

And make sure your Gmail username and password is correct.

Check my answer sending email to gmail from asp.net[^].

Thanks...

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