在.net中发送测试Microsoft Office 365的SMTP电子邮件

Question

我在Exchange Online服务上有一个邮件帐户。现在，我想测试，如果我能够通过C＃应用程序发送邮件给客户（在varoius域和微软的Office 365）

我试图执行下面的代码，但我得到的错误

“根据验证 过程，远程证书无效。”

MailMessage mail = null;     
mail = new MailMessage(); 

string[] strToList = "[email protected]"    
foreach (string strID in strToList) 
{ 
    if (strID != null) 
    { 
     mail.To.Add(new MailAddress(strID)); 
    } 
} 

mail.From = "[email protected]"; 
mail.Subject = "testing" 
mail.IsBodyHtml = true; 
mail.Body = "mail body"; 

SmtpClient client = new SmtpClient("smtp.outlook.office365.com"); 
client.Port = 587; 
client.EnableSsl = true; 
client.UseDefaultCredentials = false; 
NetworkCredential cred = new System.Net.NetworkCredential("[email protected]", "mypassword"); 
client.Credentials = cred; 
client.Send(mail); 

请指教，如果我做错了什么。 非常感谢。

Answer 1

尝试使用：

ServicePointManager.ServerCertificateValidationCallback = 
    (sender, certificate, chain, sslPolicyErrors) => true; 

此代码将允许你接受无效的证书。

Answer 2

的错误

SMTP服务器要求安全连接或客户端是不是 认证。服务器响应是：5.7.1客户端不是 认证

经常发生在关联的用户帐户密码过期或帐户被锁定时。尝试在Active Directory中设置“永不过期的用户密码”，如果它不违反公司的密码策略:)在使用o365 Exchange Online A/c进行测试时，发生在我身上。

Answer 3

这对我的作品（从source编辑）

ThreadPool.QueueUserWorkItem(t => 
      { 
       SmtpClient client = new SmtpClient("smtp.office365.com",587); 
       client.EnableSsl = true; 
       client.Credentials = new System.Net.NetworkCredential("[email protected]", "password"); 
       MailAddress from = new MailAddress("[email protected]", String.Empty, System.Text.Encoding.UTF8); 
       MailAddress to = new MailAddress("[email protected]"); 
       MailMessage message = new MailMessage(from, to); 
       message.Body = "The message I want to send."; 
       message.BodyEncoding = System.Text.Encoding.UTF8; 
       message.Subject = "The subject of the email"; 
       message.SubjectEncoding = System.Text.Encoding.UTF8; 
       // Set the method that is called back when the send operation ends. 
       client.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback); 
       // The userState can be any object that allows your callback 
       // method to identify this send operation. 
       // For this example, I am passing the message itself 
       client.SendAsync(message, message); 
      }); 

     private static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e) 
     { 
      // Get the message we sent 
      MailMessage msg = (MailMessage)e.UserState; 

      if (e.Cancelled) 
      { 
       // prompt user with "send cancelled" message 
      } 
      if (e.Error != null) 
      { 
       // prompt user with error message 
      } 
      else 
      { 
       // prompt user with message sent! 
       // as we have the message object we can also display who the message 
       // was sent to etc 
      } 

      // finally dispose of the message 
      if (msg != null) 
       msg.Dispose(); 
     } 

Answer 4

尝试smtp.office365.com代替smtp.outlook.office365.com

Answer 5

在某些情况下，TLS认证在c＃中使用smtp.office365.com作为SMTP可能会导致问题。 尝试发送（MSG）语句（覆盖.TargetName）之前以下行：

client.TargetName = "STARTTLS/smtp.office365.com"; 

这一个对我的作品

Answer 6

这也是发送邮件最好的办法。我在我的项目中尝试过，工作正常。

SmtpClient client = new SmtpClient("smtp.office365.com", 587); 
     client.EnableSsl = true; 
     client.Credentials = new System.Net.NetworkCredential("[email protected]", "[email protected]"); 
     MailAddress from = new MailAddress("From Address Ex [email protected]", String.Empty, System.Text.Encoding.UTF8); 
     MailAddress to = new MailAddress("From Address Ex [email protected]"); 
     MailMessage message = new MailMessage(from, to); 
     message.Body = "This is your body message"; 
     message.BodyEncoding = System.Text.Encoding.UTF8; 
     message.Subject = "Subject"; 
     message.SubjectEncoding = System.Text.Encoding.UTF8; 

     client.Send(message);