C# 服务器响应为：5.7.0 必须首先发出 STARTTLS 命令。i16sm1806350pag.18 - gsmtp
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The server response was: 5.7.0 Must issue a STARTTLS command first. i16sm1806350pag.18 - gsmtp
提问by Ankur Gupta
I am trying to send mail using gmail, and I am getting an exception that is 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. i16sm1806350pag.18 - gsmtp
我正在尝试使用 gmail 发送邮件，但出现异常 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. i16sm1806350pag.18 - gsmtp
code I have written for sending mail is:
我为发送邮件编写的代码是：
MailMessage mail = new MailMessage();
mail.To.Add(txtEmail.Text.Trim());
mail.To.Add("[email protected]");
mail.From = new MailAddress("[email protected]");
mail.Subject = "Confirmation of Registration on Job Junction.";
string Body = "Hi, this mail is to test sending mail using Gmail in ASP.NET";
mail.Body = Body;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
// smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "password");
// smtp.Port = 587;
//Or your Smtp Email ID and Password
smtp.UseDefaultCredentials = false;
// smtp.EnableSsl = true;
smtp.Send(mail);
Please tell me solutions, I am not getting any solutions for this exception.
请告诉我解决方案，我没有得到针对此异常的任何解决方案。
回答by Microsoft DN
Gmail requires you to use a secure connection. This can be set in your web.config like this:
Gmail 要求您使用安全连接。这可以在您的 web.config 中设置，如下所示：
<network host="smtp.gmail.com" enableSsl="true" ... />
OR
或者
The SSL should be enable on the webserver as well. Refer following link
也应该在网络服务器上启用 SSL。参考以下链接
回答by khanna
SEND Button logic:
发送按钮逻辑：
string fromaddr = "[email protected]";
string toaddr = TextBox1.Text;//TO ADDRESS HERE
string password = "YOUR PASSWROD";
MailMessage msg = new MailMessage();
msg.Subject = "Username &password";
msg.From = new MailAddress(fromaddr);
msg.Body = "Message BODY";
msg.To.Add(new MailAddress(TextBox1.Text));
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.Port = 587;
smtp.UseDefaultCredentials = false;
smtp.EnableSsl = true;
NetworkCredential nc = new NetworkCredential(fromaddr,password);
smtp.Credentials = nc;
smtp.Send(msg);
This code work 100%. If you have antivirus in your system or firewall that restrict sending mails from your system so disable your antivirus and firewall. After this run this code... In this above code TextBox1.Textcontrol is used for TOaddress.
此代码工作 100%。如果您的系统或防火墙中有限制从系统发送邮件的防病毒软件，请禁用防病毒软件和防火墙。在此之后运行此代码...在上面的代码中，TextBox1.Text控件用于TOaddress.
回答by musmahn
Step (1):smtp.EnableSsl = true;
第1步）：smtp.EnableSsl = true;
if not enough:
如果还不够：
Step (2):"Access for less secure apps" must be enabled for the Gmail account used by the NetworkCredentialusing google's settings page:
第 (2) 步：必须为使用谷歌设置页面的 Gmail 帐户启用“访问不太安全的应用程序” ：NetworkCredential
回答by k3ka
"https://www.google.com/settings/security/lesssecureapps" use this link after log in your gmail account and click turn on.Then run your application,it will work surely.
“ https://www.google.com/settings/security/lesssecureapps” 登录您的gmail帐户并单击打开后使用此链接。然后运行您的应用程序，它肯定会工作。
回答by DavidG
This issue haunted me overnight as well. Here's how to fix it:
这个问题也困扰了我一夜。以下是修复方法：
- Set host to: smtp.gmail.com
- Set port to: 587
- 将主机设置为：smtp.gmail.com
- 将端口设置为：587
This is the TLS Port. I had been using all of the other SMTP ports with no success. If you set enableSsl = truelike this:
这是 TLS 端口。我一直在使用所有其他 SMTP 端口，但没有成功。如果你这样设置enableSsl = true：
Dim SMTP As New SmtpClient(HOST)
SMTP.EnableSsl = True
Trim the username and password fields (good way to prevent errors if user inputs the email and password upon registering like mine does) like this:
修剪用户名和密码字段（如果用户像我一样在注册时输入电子邮件和密码是防止错误的好方法），如下所示：
SMTP.Credentials = New System.Net.NetworkCredential(EmailFrom.Trim(), EmailFromPassword.Trim())
Using the TLS Port will treat your SMTP as SMTPS allowing you to authenticate. I immediately got a warning from Google saying that my email was blocking an app that has security risks or is outdated. I proceeded to "Turn on less secure apps". Then I updated the information about my phone number and google sent me a verification code via text. I entered it and voila!
使用 TLS 端口会将您的 SMTP 视为允许您进行身份验证的 SMTPS。我立即收到来自 Google 的警告，说我的电子邮件阻止了一个存在安全风险或已过时的应用程序。我继续“打开不太安全的应用程序”。然后我更新了关于我的电话号码的信息，谷歌通过短信向我发送了一个验证码。我输入了它，瞧！
I ran the application again and it was successful. I know this thread is old, but I scoured the net reading all the exceptions it was throwing and adding MsgBoxes after every line to see what went wrong. Here's my working code modified for readability as all of my variables are coming from MySQL Database:
我再次运行该应用程序，它成功了。我知道这个线程很旧，但我搜索了网络，阅读了它抛出的所有异常，并在每一行后添加 MsgBoxes 以查看出了什么问题。这是我为了可读性而修改的工作代码，因为我的所有变量都来自 MySQL 数据库：
Try
Dim MySubject As String = "Email Subject Line"
Dim MyMessageBody As String = "This is the email body."
Dim RecipientEmail As String = "[email protected]"
Dim SenderEmail As String = "[email protected]"
Dim SenderDisplayName As String = "FirstName LastName"
Dim SenderEmailPassword As String = "SenderPassword4Gmail"
Dim HOST = "smtp.gmail.com"
Dim PORT = "587" 'TLS Port
Dim mail As New MailMessage
mail.Subject = MySubject
mail.Body = MyMessageBody
mail.To.Add(RecipientEmail)
mail.From = New MailAddress(SenderEmail, SenderDisplayName)
Dim SMTP As New SmtpClient(HOST)
SMTP.EnableSsl = True
SMTP.Credentials = New System.Net.NetworkCredential(SenderEmail.Trim(), SenderEmailPassword.Trim())
SMTP.DeliveryMethod = SmtpDeliveryMethod.Network
SMTP.Port = PORT
SMTP.Send(mail)
MsgBox("Sent Message To : " & RecipientEmail, MsgBoxStyle.Information, "Sent!")
Catch ex As Exception
MsgBox(ex.ToString)
End Try
I hope this code helps the OP, but also anyone like me arriving to the party late. Enjoy.
我希望这段代码对 OP 有帮助，但也希望像我这样迟到的人。享受。
回答by Ernest
If you are passing (like me) all the parameters like port, username, passwordthrough a system and you are not allow to modify the code, then you can do that easy change on the web.config:
如果您（像我一样）通过系统传递所有参数，例如port、username、password并且您不允许修改代码，那么您可以在以下位置进行轻松更改web.config：
<system.net>
<mailSettings>
<smtp>
<network enableSsl="true"/>
</smtp>
</mailSettings>
</system.net>
回答by R Porter
If you get the error "Unrecognized attribute 'enableSsl'" when following the advice to add that parameter to your web.config. I found that I was able to workaround the error by adding it to my code file instead in this format:
如果您按照建议将该参数添加到您的 web.config 时收到错误“无法识别的属性 'enableSsl'”。我发现我可以通过将错误添加到我的代码文件中来解决这个错误：
SmtpClient smtp = new SmtpClient();
smtp.EnableSsl = true;
try
{
smtp.Send(mm);
}
catch (Exception ex)
{
MsgBox("Message not emailed: " + ex.ToString());
}
This is the system.net section of my web.config:
这是我的 web.config 的 system.net 部分：
<system.net>
<mailSettings>
<smtp from="<from_email>">
<network host="smtp.gmail.com"
port="587"
userName="<your_email>"
password="<your_app_password>" />
</smtp>
</mailSettings>
</system.net>
回答by user1400290
I also got the same error using the code:
使用代码我也遇到了同样的错误：
MailMessage mail = new MailMessage();
mail.To.Add(txtEmail.Text.Trim());
mail.To.Add("[email protected]");
mail.From = new MailAddress("[email protected]");
mail.Subject = "Confirmation of Registration on Job Junction.";
string Body = "Hi, this mail is to test sending mail using Gmail in ASP.NET";
mail.Body = Body;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
// smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "password");
// smtp.Port = 587;
//Or your Smtp Email ID and Password
smtp.UseDefaultCredentials = false;
// smtp.EnableSsl = true;
smtp.Send(mail);
But moving 2 lines upward fixed the problem:
但是向上移动 2 行解决了问题：
MailMessage mail = new MailMessage();
mail.To.Add(txtEmail.Text.Trim());
mail.To.Add("[email protected]");
mail.From = new MailAddress("[email protected]");
mail.Subject = "Confirmation of Registration on Job Junction.";
string Body = "Hi, this mail is to test sending mail using Gmail in ASP.NET";
mail.Body = Body;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
// smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
smtp.UseDefaultCredentials = false;
smtp.EnableSsl = true;
smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "password");
// smtp.Port = 587;
//Or your Smtp Email ID and Password
smtp.Send(mail);
回答by Sunil Saini
**this is first part of program**
<head runat="server">
<title></title>
<style>
.style4
{
margin-left:90px;
}
.style3{
margin-left:130px;
}
.style2{
color:white;
margin-left:100px;
height:400px;
width:450px;
text-align:left;
}
.style1{
height:450px;
width:550px;
margin-left:450px;
margin-top:100px;
margin-right:500px;
background-color:rgba(0,0,0,0.9);
}
body{
margin:0;
padding:0;
}
body{
background-image:url("/stock/50.jpg");
background-size:cover;
background-repeat:no-repeat;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<div class="style1">
<table class="style2">
<tr>
<td colspan="2"><h1 class="style4">Sending Email</h1></td>
</tr>
<tr>
<td>To</td>
<td><asp:TextBox ID="txtto" runat="server" Height="20px" Width="250px" placeholder="[email protected]"></asp:TextBox><asp:RequiredFieldValidator ForeColor="Red" runat="server" ErrorMessage="Required" ControlToValidate="txtto" Display="Dynamic"></asp:RequiredFieldValidator><asp:RegularExpressionValidator runat="server" ForeColor="Red" ControlToValidate="txtto" Display="Dynamic" ErrorMessage="Invalid Email_ID" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator> </td>
</tr>
<tr>
<td>From</td>
<td><asp:TextBox ID="txtfrom" runat="server" Height="20px" Width="250px" placeholder="[email protected]"></asp:TextBox> <asp:RequiredFieldValidator ForeColor="Red" Display="Dynamic" runat="server" ErrorMessage="Required" ControlToValidate="txtfrom"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator Display="Dynamic" runat="server" ErrorMessage="Invalid Email-ID" ControlToValidate="txtfrom" ForeColor="Red" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td>Subject</td>
<td><asp:TextBox ID="txtsubject" runat="server" Height="20px" Width="250px" placeholder="Demonstration on Youtube"></asp:TextBox><asp:RequiredFieldValidator ForeColor="Red" runat="server" ErrorMessage="Required" ControlToValidate="txtsubject"></asp:RequiredFieldValidator> </td>
</tr>
<tr>
<td>Body</td>
<td><asp:TextBox ID="txtbody" runat="server" Width="250px" TextMode="MultiLine" Rows="5" placeholder="This is the body text"></asp:TextBox><asp:RequiredFieldValidator ForeColor="Red" runat="server" ErrorMessage="Required" ControlToValidate="txtbody"></asp:RequiredFieldValidator> </td>
</tr>
<tr>
<td colspan="2"><asp:Button CssClass="style3" BackColor="Green" BorderColor="green" ID="send" Text="Send" runat="server" Height="30px" Width="100px" OnClick="send_Click"/></td>
</tr>
<tr>
<td colspan="2"><asp:Label ID="lblmessage" runat="server"></asp:Label> </td>
</tr>
</table>
</div>
</div>
</form>
</body>
</html>
**this is second part of program**
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net.Mail;
namespace WebApplication6
{
public partial class sendingemail1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void send_Click(object sender, EventArgs e)
{
try
{
MailMessage message = new MailMessage();
message.To.Add(txtto.Text);
message.Subject = txtsubject.Text;
message.Body = txtbody.Text;
message.From = new MailAddress(txtfrom.Text);
SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
client.EnableSsl = true;
client.Credentials = new System.Net.NetworkCredential(txtfrom.Text, "Sunil@123");
for(int i=1;i<=100;i++)
{
client.Send(message);
lblmessage.Text = "Mail Successfully send";
}
}
catch (Exception ex)
{
lblmessage.Text = ex.Message;
}
}
}
}
回答by bizl
Loginto your gmail account https://myaccount.google.com/u/4/security-checkup/4
登录您的 Gmail 帐户https://myaccount.google.com/u/4/security-checkup/4
(See photo) review all locations Google may have blocked for "unknown" or suspicious activity.
（见照片）查看 Google 可能因“未知”或可疑活动而屏蔽的所有位置。
