Question

我正在尝试使用默认凭据和SMTPClient发送电子邮件。

我得到的例外是：

SMTP服务器需要安全连接，或者客户端未通过身份验证。服务器响应为：5.7.1客户端未通过身份验证。

我要使用的代码：

public void SendEmail(List<string> recipients, string subject, string body)
{
    if (recipients.Count == 0)
        return;

    MailMessage mail = new MailMessage();
    SmtpClient client = new SmtpClient();
    foreach (string to in recipients)
    {
        mail.To.Add(to);                
    }

    mail.From = new MailAddress("email@email.com");
    client.Port = 25;
    client.DeliveryMethod = SmtpDeliveryMethod.Network;
    client.UseDefaultCredentials = true;
    client.Host = "smtprelay.email.com";

    //client.Credentials = new System.Net.NetworkCredential("email@email.com", password);
    ServicePointManager.ServerCertificateValidationCallback = delegate (object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; };

    client.EnableSsl = true;
    mail.Subject = subject;
    mail.Body = body;
    mail.IsBodyHtml = true;

    try
    {
        client.Send(mail);
    }
    catch(Exception e)
    {
        Console.Write(e.Message);
    }
    mail.Dispose();
}

我使用EnableSsl = true和false进行了测试，但均无效果。如果我将UseDefaultCredentials设置为false，并通过NetworkCredential给予它们，那么它将起作用。

是否有需要交换的设置或需要设置的设置？

编辑：int ServerCertificateCallback，我得到： '（（（System.Net.Mail.SmtpClient）s）.ServicePoint.Address'引发了类型为'System.NotSupportedException'的异常

和sslPolicyErrors是System.Net.Security.SslPolicyErrors.RemoteCertificateNameMismatch

这是否意味着组策略不允许这样做？

Answer 1

Exchange需要一个有效的域帐户（登录/密码）或您的邮局主管已配置为允许的IP地址。

Answer 2

您可以在下面尝试此代码

public static void logMail(string err)
        {
            SmtpClient smtp = new SmtpClient();
            smtp.Credentials = new System.Net.NetworkCredential("email@email.com", "password");
            smtp.Port = 25;
            smtp.Host = "mail.email.com";

            MailAddress from = new MailAddress("email@email.com", "test");
            MailAddress to = new MailAddress("vb_error@email.com"); 
            MailMessage mail = new MailMessage(from, to);
            mail.IsBodyHtml = true;
            mail.Subject = "Error";
            mail.Body = "<b>Error Message:</b> " + err;
            smtp.Send(mail);
        }

C＃使用默认凭据发送电子邮件：异常

2 个答案: