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

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

其他回答

我也遇到过同样的问题。当您打开2步验证(MFA)时，就会发生这种情况。只要关闭2步验证，你的问题就解决了。

2014-07-31 16:02:23

我真的看过很多想法，唯一的解决方案是这种方式(适用于不同的电子邮件提供商):

            try
        {
            ViewProgressbar("Try to connect mail-server...", progressBar1.Value = 20);
            string host = dsProvider.Rows[y]["POP_hostOut"].ToString();
            int port = int.Parse(dsProvider.Rows[y]["POP_portOut"].ToString());  //587
            string[] email = von1.Split('@');
            string userName = (dsProvider.Rows[y]["login"].ToString() == "email[0]@email[1]")? email[0]+"@"+email[1] : email[0];
            string password = layer.getUserPassword(listSender.SelectedValue.ToString());
            SmtpClient client = new SmtpClient(host, port);
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.UseDefaultCredentials = false;
            //A idea from MSDN but it not works. You got "The server response was: 5.5.1 Authentication Required."
            //System.Net.NetworkCredential myCreds = new System.Net.NetworkCredential(userName, password, host);
            //System.Net.CredentialCache cache = new System.Net.CredentialCache();
            //cache.Add(host, port, "NTLM", myCreds);
            ///cache.GetCredential(host, port, "NTLM");   //NTLM
            client.Credentials = new System.Net.NetworkCredential(userName, password);
            client.Host = host;
            client.Port = port;
            client.EnableSsl = true;
            client.Send(message);
            ViewProgressbar();
        }
        catch (SmtpException ex)...

2014-05-09 11:21:15

嗨，我也有同样的问题，

我是怎么解决它的。就是打开不太安全的应用。在连接到我的gmail帐户后。我输入了这个链接:https://www.google.com/settings/security/lesssecureapps

然后我打开安全应用程序，它就工作了。上面也说过

2015-03-05 13:18:00

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

当您尝试从不同的时区或IP地址计算机登录时，通常会发生这种情况。您的生产服务器和您使用的邮件id都位于不同的时区。以下两种方案任选其一:

1)通过远程访问登录生产服务器，并使用您的凭证登录gmail一次。他们会要求确认，确认后注销。

或者2)登录gmail到你的本地计算机，按照这个链接，选择审查这个活动，并采取适当的行动。

2014-01-03 15:06:40

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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