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

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

其他回答

在今天花了几个小时尝试了这里的每个解决方案之后,我仍然无法克服这个错误。我以这种方式多次使用gmail,所以我知道这是一个愚蠢的东西,但我没有做任何事情来解决这个问题。我终于偶然发现了我的解决方案,所以我想分享一下。

首先,上面的大多数答案也是必需的,但在我的例子中,这只是在创建SmtpClient类时对代码进行排序的简单问题。

在下面的第一个代码片段中,请注意Credentials = creds行所在的位置。这个实现将生成这个问题中引用的错误,即使您已经正确设置了其他所有内容。

System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient
{
    Host = Emailer.Host,
    Port = Emailer.Port,
    Credentials = creds,
    EnableSsl = Emailer.RequireSSL,
    UseDefaultCredentials = false,
    DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network
}

但是,如果您将凭证设置调用移到底部,则电子邮件将正常发送。我没有改变周围的代码…用户名/密码等。显然,无论是EnableSSL、UseDefaultCredentials还是DeliveryMethod都依赖于先设置的凭证…不过,我并没有全部测试以确定是哪一个。

System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient
{
    Host = Emailer.Host,
    Port = Emailer.Port,
    EnableSsl = Emailer.RequireSSL,
    UseDefaultCredentials = false,
    DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network,
    Credentials = creds
}

希望这能帮助其他人在未来避免一些头痛。

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

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。

尝试改变主机,这是一个新的,我得到了这个配置mozilla雷鸟

Host = "smtp.googlemail.com"

这对我很有用

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