Question

我想在没有

的情况下运行以下代码

NetworkCredential nc = new Net.NetworkCredential("USERNAME", "PASSWORD").

仅使用Exchange主机（服务器名称）和端口

我得到错误对于此代码：邮箱不可用。服务器响应为：5.7.1客户端无权作为此发件人发送

protected void SendEmail(object sender, EventArgs e)
{
    SmtpClient smtpClient = new SmtpClient("ExchangeServerName",25);
    MailMessage message = new MailMessage();
    try
    {
        MailAddress fromAddress = new MailAddress("bala@OfficeName.com", "From Me");
        MailAddress toAddress = new MailAddress("bala@OfficeName.com", "To You");
        message.From = fromAddress;
        message.To.Add(toAddress);
        message.Subject = "Testing!";
        message.Body = "This is the body of a sample message";
        smtpClient.UseDefaultCredentials = true;
        System.Net.NetworkCredential nc = CredentialCache.DefaultNetworkCredentials;
        smtpClient.Credentials = (System.Net.ICredentialsByHost)nc.GetCredential("ExchangeServerName", 25, "Basic");
        smtpClient.Send(message);
        lblText.Text ="Email sent.";
    }
    catch (Exception ex)
    {
        lblText.Text = "Coudn't send the message!\n  " + ex.Message;
    }
}

Answer 1

我做到了。有关我的代码的更多详细信息，请使用this link。

以下代码与

一起运行良好

服务器：Windows Server 2003，Windows Server 2008，Windows Server 2008 R2

IIS：6.0,7.0

.Net Frame Wotk：2.0,3.5,4.0

string sMessage;
SmtpClient smtpClient = new SmtpClient();
MailMessage message = new MailMessage();
try
{

 //you can provide invalid from address. but to address Should be valil
MailAddress fromAddress = new MailAddress("bala@technospine.com", "BALA");

smtpClient.Host = "Exchange Server Name";
smtpClient.Port = 25;
//smtpClient.Port = 587;


smtpClient.UseDefaultCredentials = true; 

message.From = fromAddress;
message.To.Add(bala@technospine.com); //Recipent email 
message.Subject = _subject;
message.Body = _details;
message.IsBodyHtml = true;

//smtpClient.EnableSsl = true; 

smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;

smtpClient.Send(message); 

sMessage = "Email sent.";
}
catch (Exception ex)
{
sMessage = "Coudn't send the message!\n " + ex.Message;
}


lblMailStatus.Text = sMessage;

Answer 2

您正在尝试使用Exchange发送邮件。为此，发件人（或发送进程）必须对其登录的帐户具有权限，以代表您指定为发件人的用户进行发送。这与通过Exchange的SMTP邮件传输代理（MTA）不同，以便让Exchange接收和路由电子邮件。因此，您知道应该使用SMTP执行此操作，因此您正走在正确的轨道上，但您只是尝试使用错误的API来实现此目的。您想要查看CDOSYS以通过SMTP MTA发送它，而无需进行用户身份验证。在System.Web.Mail.MailMessage上搜索更具体的示例 - 有很多内容。如果Exchange服务器似乎不接受/传递以这种方式传递给它的SMTP消息，您可能只需要稍微打开其配置。在这种情况下，Exchange服务器可能配置了对通过其SMTP MTA接收的邮件路由的严格安全性，并且只需要将要发送这些邮件的计算机的IP地址配置为允许邮件转发。

Answer 3

尝试NetworkCredential nc = new Net.NetworkCredential（“USERNAME”，“PASSWORD”，“DOMAIN”）

如何使用SMTP通过Exchange Server发送邮件

3 个答案: