C# 通过SmtpClient发送电子邮件

我的outlook可以使用我的帐户设置发送电子邮件。 但是我不能从C#发电子邮件

以下是我的帐户设置：

Microsoft exchange server: exch.server1.com;
User name: user1@server1.com;
Password: password1;

-----安全选项卡-----

-----连接选项卡-----

-----Exchange代理设置窗体-----

这是我的C#代码：

出现以下异常：

无法解析远程名称：“exch.server1.com”

此url“exch.server1.com”已从我的办公室被阻止。 请建议我如何配置SmtpClient以发送电子邮件

Encrypt data between Microsoft Office Outlook and Microsoft Exchange - CHECKED;
Logon network security: Negotiate Authentication;

Connect using my Local Area Network (LAN) - SELECTED;
Connect to Microsoft Exchange using HTTP - CHECKED;

Use this email to connect to my proxy server fo Exchange: https://owa.server1.com
Connect using SSL only - CHECKED;
Only connect to proxy servers that have this principal name in their certificate: msstd:owa.server1.com;
Proxy authentication settings: NTLM Authentication;

var completeMessage = new MailMessage();
completeMessage.From = new MailAddress("ivanov@server1.com");
completeMessage.To.Add("ivanov@server1.com");
completeMessage.Subject = "test subject";
completeMessage.Body ="test body";
var client = new SmtpClient("exch.server1.com");
client.Credentials = new NetworkCredential("user1@server1.com", "password1");
client.Send(completeMessage);