Gmail错误:SMTP服务器需要安全连接或客户端未经过身份验证。服务器的响应是:5.5.1需要身份验证

我正在使用以下代码发送电子邮件。代码在我的本地机器上正常工作。但是在生产服务器上，我得到了错误消息

var fromAddress = new MailAddress("mymailid@gmail.com");
var fromPassword = "xxxxxx";
var toAddress = new MailAddress("yourmailid@yourdoamain.com");

string subject = "subject";
string body = "body";

System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient
{
    Host = "smtp.gmail.com",
    Port = 587,
    EnableSsl = true,
    DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network,
    UseDefaultCredentials = false,
    Credentials = new NetworkCredential(fromAddress.Address, fromPassword)       
};

using (var message = new MailMessage(fromAddress, toAddress)
{
    Subject = subject,
    Body = body
})

smtp.Send(message);

在我的Gmail A/c上，我从生产服务器运行代码后收到了以下电子邮件

Hi , Someone recently used your password to try to sign in to your Google Account mymailid@gmail.com. This person was using an application such as an email, client or mobile device. We prevented the sign-in attempt in case this was a hijacker trying to access your account. Please review the details of the sign-in attempt: Friday, 3 January 2014 13:56:08 o'clock UTC IP Address: xxx.xx.xx.xxx (abcd.net.) Location: Philadelphia PA, Philadelphia, PA, USA If you do not recognise this sign-in attempt, someone else might be trying to access your account. You should sign in to your account and reset your password immediately. Reset password If this was you and you are having trouble accessing your account, complete the troubleshooting steps listed at http://support.google.com/mail?p=client_login Yours sincerely, The Google Accounts team

当前回答

我在部署到Microsoft Azure的应用程序中遇到了同样的问题。

SmtpException: SMTP服务器需要安全连接，或者SMTP服务器需要安全连接客户端未被验证。服务器的响应是:5.5.1 认证要求。

首先，我在以下页面上批准了所有未知设备(一些来自爱尔兰的ip地址)(以gmail用户登录): https://security.google.com/settings/u/1/security/secureaccount

我对客户端进行了如下设置:

var client = new SmtpClient("smtp.gmail.com");
client.Port = 587;
client.EnableSsl = true;
client.UseDefaultCredentials = false;
client.Credentials = new NetworkCredential("my_user_name@gmail.com", "my_password");

只有当我在smtp-client上设置了以下属性后，它才开始工作:

client.TargetName = "STARTTLS/smtp.gmail.com";

2015-09-11 12:38:50

其他回答

我在部署到Microsoft Azure的应用程序中遇到了同样的问题。

SmtpException: SMTP服务器需要安全连接，或者SMTP服务器需要安全连接客户端未被验证。服务器的响应是:5.5.1 认证要求。

首先，我在以下页面上批准了所有未知设备(一些来自爱尔兰的ip地址)(以gmail用户登录): https://security.google.com/settings/u/1/security/secureaccount

我对客户端进行了如下设置:

var client = new SmtpClient("smtp.gmail.com");
client.Port = 587;
client.EnableSsl = true;
client.UseDefaultCredentials = false;
client.Credentials = new NetworkCredential("my_user_name@gmail.com", "my_password");

只有当我在smtp-client上设置了以下属性后，它才开始工作:

client.TargetName = "STARTTLS/smtp.gmail.com";

2015-09-11 12:38:50

下面是我的代码。我也有同样的错误，但问题是我给我的密码错误。下面的代码将完美地工作..尝试一下

            MailMessage mail = new MailMessage();
            SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");             
            mail.From = new MailAddress("fromaddress@gmail.com");
            mail.To.Add("toaddress1@gmail.com");
            mail.To.Add("toaddress2@gmail.com");
            mail.Subject = "Password Recovery ";
            mail.Body += " <html>";
            mail.Body += "<body>";
            mail.Body += "<table>";
            mail.Body += "<tr>";
            mail.Body += "<td>User Name : </td><td> HAi </td>";
            mail.Body += "</tr>";

            mail.Body += "<tr>";
            mail.Body += "<td>Password : </td><td>aaaaaaaaaa</td>";
            mail.Body += "</tr>";
            mail.Body += "</table>";
            mail.Body += "</body>";
            mail.Body += "</html>";
            mail.IsBodyHtml = true;
            SmtpServer.Port = 587;
            SmtpServer.Credentials = new System.Net.NetworkCredential("sendfrommailaddress.com", "password");
            SmtpServer.EnableSsl = true;
            SmtpServer.Send(mail);

你可以在我的博客里查阅

2014-05-13 02:12:14

2018年11月，我尝试了以上所有方法，但都没有成功。

下面是最终有效的解决方案。不幸的是，它不使用SSL，但它工作!!

var fromAddress = new MailAddress(asd@asd.com, "From Name");
var toAddress = new MailAddress("tosend@asd.com", "To Name");

const string subject = "Subject";
const string body = "Body";

var smtp = new SmtpClient
{
    Host = "aspmx.l.google.com",
    Port = 25,
    EnableSsl = false
};
using (var message = new MailMessage(fromAddress, toAddress)
{
    Subject = subject,
    Body = body
})
{
    smtp.Send(message);
}

2018-11-29 16:52:59

不要在等待smtp.SendMailAsync(邮件)前设置断点;

当它等待一个断点给出这个错误时，当我删除断点时，它已经工作了

2018-12-06 21:14:15

您可能需要从gmail创建/生成一个特定的APP密码。您的应用程序或脚本将使用这个新密码，而不是您的常规密码。您的常规密码仍然可以正常工作。

这对我来说很重要。我仍然使用相同的电子邮件帐户，但必须生成一个新的应用程序特定的密码。

https://support.google.com/accounts/answer/185833?hl=en

基本上你可以在这里做: https://security.google.com/settings/security/apppasswords

2016-01-20 20:33:48

Gmail错误:SMTP服务器需要安全连接或客户端未经过身份验证。服务器的响应是:5.5.1需要身份验证

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