通过所有端口上的C#.Net错误GMail SMTP

Question

通过所有端口上的C#.Net错误GMail SMTP

我一直在努力寻找这个问题,到目前为止一直在悲惨地失败.我最近的尝试是从这个堆栈代码中解除的: 通过带有C#的Gmail SMTP服务器发送电子邮件,但我已经尝试了我可以在堆栈和其他地方找到的所有语法.我的代码目前是:

var client = new SmtpClient("smtp.gmail.com", 587)
{
    Credentials = new NetworkCredential("me@gmail.com", "mypass"),
    EnableSsl = true
};

client.Send("me@gmail.com","me@gmail.com","Test", "test message");

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运行该代码给我一个立即异常"发送邮件失败",其中包含"无法连接到远程服务器"的内容.

如果我将端口更改为465(如gmail文档建议的那样),我每次都会超时.

我已经读过465不是一个好用的端口,所以我想知道这笔交易是什么让我无法连接.我的用户和通行证是对的.我已经读过我必须在我的Gmail帐户上设置POP服务,所以我这样做了.徒劳无功.

我原本试图让我的品牌GMail帐户工作,但遇到同样的问题,我认为我/我的常规Gmail帐户将更容易...到目前为止,情况并非如此.

Answer 1

Bry*_*red 15

我不久前也遇到过这个问题.问题是SmtpClient不支持隐式SSL连接,但支持显式连接(使用SSL的System.Net.Mail对端口465进行身份验证).上一类MailMessage(我相信.Net 1.0)确实支持这一点,但早已过时了.

我的回答是直接通过COM 调用CDO(协作数据对象)(http://support.microsoft.com/kb/310212),使用类似下面的内容:

    /// <summary>
    /// Send an electronic message using the Collaboration Data Objects (CDO).
    /// </summary>
    /// <remarks>http://support.microsoft.com/kb/310212</remarks>
    private void SendTestCDOMessage()
    {
        try
        {
            string yourEmail = "YourUserName@gmail.com";

            CDO.Message message = new CDO.Message();
            CDO.IConfiguration configuration = message.Configuration;
            ADODB.Fields fields = configuration.Fields;

            Console.WriteLine(String.Format("Configuring CDO settings..."));

            // Set configuration.
            // sendusing:               cdoSendUsingPort, value 2, for sending the message using the network.
            // smtpauthenticate:     Specifies the mechanism used when authenticating to an SMTP service over the network.
            //                                  Possible values are:
            //                                  - cdoAnonymous, value 0. Do not authenticate.
            //                                  - cdoBasic, value 1. Use basic clear-text authentication. (Hint: This requires the use of "sendusername" and "sendpassword" fields)
            //                                  - cdoNTLM, value 2. The current process security context is used to authenticate with the service.

            ADODB.Field field = fields["http://schemas.microsoft.com/cdo/configuration/smtpserver"];
            field.Value = "smtp.gmail.com";

            field = fields["http://schemas.microsoft.com/cdo/configuration/smtpserverport"];
            field.Value = 465;

            field = fields["http://schemas.microsoft.com/cdo/configuration/sendusing"];
            field.Value = CDO.CdoSendUsing.cdoSendUsingPort;

            field = fields["http://schemas.microsoft.com/cdo/configuration/smtpauthenticate"];
            field.Value = CDO.CdoProtocolsAuthentication.cdoBasic;

            field = fields["http://schemas.microsoft.com/cdo/configuration/sendusername"];
            field.Value = yourEmail;

            field = fields["http://schemas.microsoft.com/cdo/configuration/sendpassword"];
            field.Value = "YourPassword";

            field = fields["http://schemas.microsoft.com/cdo/configuration/smtpusessl"];
            field.Value = "true";

            fields.Update();

            Console.WriteLine(String.Format("Building CDO Message..."));

            message.From = yourEmail;
            message.To = yourEmail;
            message.Subject = "Test message.";
            message.TextBody = "This is a test message. Please disregard.";

            Console.WriteLine(String.Format("Attempting to connect to remote server..."));

            // Send message.
            message.Send();

            Console.WriteLine("Message sent.");
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }

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不要忘记浏览COM引用并添加"Microsoft CDO for Windows 200 Library",它应该添加两个引用:ADODB和CDO.