我写了一个非常基本的类来发送电子邮件。我用smtp服务器测试了它，它工作正常，但是当我尝试使用我公司的交换服务器时，它给出了以下异常：
SMTP 服务器需要安全连接，或者客户端未经过身份验证。服务器响应为：5.7.1 客户端未通过身份验证
我的代码如下：
MailMessage mailMessage = new MailMessage("From@company.com", "To@company.com", "Test Subject", "Void body");
SmtpClient smtpClient = new SmtpClient(smtpServerAddress, smtpServerPort);
NetworkCredential credentials = new NetworkCredential(AccountName,Password);
smtpClient.UseDefaultCredentials = false;
smtpClient.Credentials = credentials;
smtpClient.EnableSsl = true;
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
ServicePointManager.ServerCertificateValidationCallback = delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; }; // without this I get: The remote certificate is invalid according to the validation procedure.
smtpClient.Send(mailMessage);
我是否需要以不同于 smtp 服务器的方式处理交换服务器。
请指教谢谢
您使用的端口号是否正确？
协议：SMTP/SSL
•端口 （TCP/UDP）：465 （TCP）
•说明：基于 SSL 的 SMTP。TCP 端口 465 由公共端口保留 使用 SSL 进行安全 SMTP 通信的行业实践 协议。但是，与 IMAP4、POP3、NNTP 和 HTTP 不同，SMTP 在 Exchange 2000 不使用单独的端口进行安全通信 （SSL），而是采用称为"带内安全子系统" 传输层安全性 （TLS）。使 TLS 能够在 Exchange 上工作 2000，您必须在 Exchange 2000 上安装计算机证书 服务器。
从这里撕下来：http://www.petri.co.il/ports_used_by_exchange.htm
我刚刚遇到了这个问题。在 Exchange 服务器上，输入 Exchange 系统管理器并打开服务器的对象树，然后打开协议，然后右键单击默认的 SMTP 虚拟服务器并选择属性。单击访问选项卡，然后单击身份验证按钮。最后单击"用户"，并确保您使用的用户有权访问 SMTP 中继。此外，如果您尚未这样做，请选择SMTP下的中继按钮，并确保运行该应用程序的计算机未被列入黑名单或已被授予权限。
我发现了这篇关于使用交换发送电子邮件的文章。他似乎正在使用 Microsoft.Exchange.WebServices 命名空间。我没有交换可以测试。只是提出想法。
http://waqarsherbhatti.posterous.com/sending-email-using-exchange-server-2010-ews
您可能想尝试使用 WebDAV 发送。如果你想尝试一下，这是我的方法。
public static void ViaWebDav(String sMailbox, String sExchange, String sTo, String sCc, String sSubject, String sBody, params String[] sAttachments)
{
HttpWebRequest hwrOut;
HttpWebResponse hwrIn;
//String strServer = "SXGM-202.xxx.com";
//string strPassword = "123";
//string strUserID = "u";
//string strDomain = "fg";
Byte[] b = null;
Stream s = null;
String sMailboxUrl = "http://" + sExchange + "/exchange/" + sMailbox;
String sMailboxSend = sMailboxUrl + "/##DavMailSubmissionURI##/";
String sMailboxTemp = sMailboxUrl + "/drafts/" + sSubject + ".eml";
// Construct the RFC 822 formatted body of the PUT request.
// Note: If the From: header is included here,
// the MOVE method request will return a
// 403 (Forbidden) status. The From address will
// be generated by the Exchange server.
StringBuilder sb = new StringBuilder();
sb.AppendLine("To: " + sTo);
if (!sCc.IsEmpty()) sb.AppendLine("Cc: " + sCc);
sb.AppendLine("Subject: " + sSubject);
sb.AppendLine("Date: " + System.DateTime.Now);
sb.AppendLine("X-Mailer: AML FIU;");
sb.AppendLine("MIME-Version: 1.0;");
sb.AppendLine("Content-Type: text/plain;");
sb.AppendLine("Charset = "iso-8859-1"");
sb.AppendLine("Content-Transfer-Encoding: 7bit;");
sb.AppendLine();
sb.AppendLine(sBody);
// Create a new CredentialCache object and fill it with the network
// credentials required to access the server.
//MyCredentialCache = new CredentialCache();
//MyCredentialCache.Add(new System.Uri(strMailboxURI),
// "NTLM",
// new NetworkCredential(strUserID, strPassword, strDomain)
// );
// Create the HttpWebRequest object.
hwrOut = (HttpWebRequest)HttpWebRequest.Create(sMailboxTemp);
hwrOut.Credentials = CredentialCache.DefaultCredentials;
hwrOut.Method = "PUT";
hwrOut.ContentType = "message/rfc822";
// Encode the body using UTF-8.
b = Encoding.UTF8.GetBytes(sb.ToString());
hwrOut.ContentLength = b.Length;
s = hwrOut.GetRequestStream();
s.Write(b, 0, b.Length);
s.Close();
// PUT the message in the Drafts folder of the mailbox.
hwrIn = (HttpWebResponse)hwrOut.GetResponse();
#region //ATTACHMENTS
//Do the PROPPATCH
sb = new StringBuilder();
sb.Append("<?xml version='1.0'?>");
sb.Append("<d:propertyupdate xmlns:d='DAV:'>");
sb.Append("<d:set>");
sb.Append("<d:prop>");
sb.Append("<isCollection xmlns='DAV:'>False</isCollection>");
sb.Append("</d:prop>");
sb.Append("</d:set>");
sb.Append("</d:propertyupdate>");
foreach (String sAttach in sAttachments)
{
hwrOut = (HttpWebRequest)HttpWebRequest.Create(sMailboxTemp);
hwrOut.Credentials = CredentialCache.DefaultCredentials;
hwrOut.Method = "PROPPATCH";
hwrOut.ContentType = "text/xml";
hwrOut.Headers.Set("Translate", "f");
b = Encoding.UTF8.GetBytes(sb.ToString());
hwrOut.ContentLength = b.Length;
s = hwrOut.GetRequestStream();
s.Write(b, 0, b.Length);
s.Close();
hwrIn = (HttpWebResponse)hwrOut.GetResponse();
hwrOut = (HttpWebRequest)HttpWebRequest.Create(sMailboxTemp + "/" + Path.GetFileName(sAttach));
hwrOut.Credentials = CredentialCache.DefaultCredentials;
hwrOut.Method = "PUT";
using (FileStream fs = new FileStream(sAttach, FileMode.Open, FileAccess.Read))
{
b = new Byte[fs.Length];
fs.Read(b, 0, (Int32)fs.Length);
}
hwrOut.ContentLength = b.Length;
s = hwrOut.GetRequestStream();
s.Write(b, 0, b.Length);
s.Close();
hwrIn = (HttpWebResponse)hwrOut.GetResponse();
}
#endregion
// Create the HttpWebRequest object.
hwrOut = (HttpWebRequest)HttpWebRequest.Create(sMailboxTemp);
hwrOut.Credentials = CredentialCache.DefaultCredentials;
hwrOut.Method = "MOVE";
hwrOut.Headers.Add("Destination", sMailboxSend);
hwrIn = (HttpWebResponse)hwrOut.GetResponse();
// Clean up.
hwrIn.Close();
}