C# SmtpClient class 無法使用 ZDE01C1D48DB6C321C6374571ZED8 發送 email

Question

我在使用我的 gmail 帳戶發送 email 時遇到問題。 我正在拔頭發。

相同的設置在 Thunderbird 中運行良好。

這是代碼。 我也嘗試過端口 465，但沒有運氣。

SmtpClient ss = new SmtpClient("smtp.gmail.com", 587);
ss.Credentials = new NetworkCredential("username", "pass");
ss.EnableSsl = true;
ss.Timeout = 10000;
ss.DeliveryMethod = SmtpDeliveryMethod.Network;
ss.UseDefaultCredentials = false;

MailMessage mm = new MailMessage("donotreply@example.com", "destination@example.com", "subject here", "my body");
mm.BodyEncoding = UTF8Encoding.UTF8;
mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
ss.Send(mm);

這是錯誤

SMTP 服務器需要安全連接或客戶端未通過身份驗證。 服務器響應為：5.5.1 需要身份驗證。 了解更多信息

這是堆棧跟蹤

   at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response)
   at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from)
   at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at email_example.Program.Main(String[] args) in C:\Users\Vince\Documents\Visual Studio 2008\Projects\email example\email example\Program.cs:line 23
   at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

Answer 1

你不會相信是什么解決了我的問題。

憑據屬性

ss.Credentials = new NetworkCredential("username", "pass");

必須在之后聲明

ss.UseDefaultCredentials = false;

所以最終的工作代碼清單是

SmtpClient ss = new SmtpClient("smtp.gmail.com", 587);
ss.EnableSsl = true;
ss.Timeout = 10000;
ss.DeliveryMethod = SmtpDeliveryMethod.Network;
ss.UseDefaultCredentials = false;
ss.Credentials = new NetworkCredential("username", "pass");

MailMessage mm = new MailMessage("donotreply@example.com", "destination@example.com", "subject here", "my body");
mm.BodyEncoding = UTF8Encoding.UTF8;
mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
ss.Send(mm);

這是一個錯誤嗎？

Answer 2

Stackoverflow 之前說過

在您的情況下，這意味着您必須使用您登錄 Google 時使用的 email 地址發送它。

Stackoverflow 還說

所以也許有一個防火牆干擾了連接。 我現在在測試您的代碼時遇到了這個問題。 嘗試建議的 TELNET-Test。

Answer 3

僅使用端口 25 為我工作。

Answer 4

這行得通，但它對性能不是很友好。 查看client.SendAsync： http://msdn.microsoft.com/en-us/library/x5x13z6h.aspx

一個示例用例：

 var message = new MailMessage("from", "to", "subject", "body");
 var client = new SmtpClient("smtp.gmail.com", 587)
            {
                Credentials = new NetworkCredential("login", "password"),
                EnableSsl = true
            };
            client.SendCompleted += (s, e) =>
            {
                client.Dispose();
                message.Dispose();
            };
            client.SendAsync(message, null);

Answer 5

這部作品很完美。 在單獨的文件MailTemplate.html中創建郵件模板。

添加正版 NetworkCredentials - 登錄名和密碼

private void SendMail()
    {
    string filename = Server.MapPath("~/MailTemplate.html");
    string username = UserName.Text.ToString();

    string mailbody = System.IO.File.ReadAllText(filename);
    mailbody = mailbody.Replace("##NAME##", username);
    string to = Email.Text;
    string from = "test@gmail.com";

    MailMessage message = new MailMessage(from, to);
    message.Subject = "Auto Response Email";
    message.Body = mailbody;
    message.BodyEncoding = Encoding.UTF8;
    message.IsBodyHtml = true;
    SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
    System.Net.NetworkCredential basicCredential = new System.Net.NetworkCredential("test@gmail.com", "test123#");
    client.EnableSsl = true;
    client.UseDefaultCredentials = true;
    client.Credentials = basicCredential;
    try
    {
        client.Send(message);
        SuccessMessage.Text = "Email Sending successfully";

    }
    catch (Exception ex)
    {

        ErrorMessage.Text = ex.Message.ToString();
    }
}

郵件模板.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>Title</title>
</head>
<body>
    <div style="border: thin solid #0066FF; width: 550px; margin: 25px auto; padding: 15px; font-family: 'Microsoft Himalaya'; font-size: x-large; font-style: normal; color: #0066FF; background-color: #EfEFF2;">
        <br />
        <p style="vertical-align: middle">Dear ##NAME##,</p>
    </div>
</body>
</html>

Answer 6

我可以驗證必須在創建 NetworkCredentials 之前將 UseDefaultCredentials 設置為 false。 我有同樣的問題。

Answer 7

在我的情況下它工作正常：

private void btnTestConnection_Click(object sender, EventArgs e)
     {
    btnTestConnection.Enabled = false;
    SmtpClient ss = new SmtpClient(txtSmtpHostName.Text.Trim(), Convert.ToInt32(numSmtpHostPort.Value));
    ss.EnableSsl = chkSmtpSecureType.Checked;
    ss.Timeout = 10000;
    ss.DeliveryMethod = SmtpDeliveryMethod.Network;
    ss.UseDefaultCredentials = false;
    ss.Credentials = new NetworkCredential(txtSmtpAccount.Text.Trim(), txtSmtpPassword.Text);

    MailMessage mm = new MailMessage(txtSmtpFromEmail.Text.Trim(), "test@example.com", "subject", "my body");
    mm.BodyEncoding = UTF8Encoding.UTF8;
    mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
    ss.SendCompleted += (s, b) =>
    {
        ss.Dispose();
        mm.Dispose();
    };
    try
    {
        ss.Send(mm);
        ss.Dispose();
        mm.Dispose();
        MessageBox.Show("Connection successfully");
    }
    catch (Exception ep)
    {
        MessageBox.Show("Connection error: " + ep.Message, "Smtp Connection Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
    btnTestConnection.Enabled = true;
}