在.net中發送測試Microsoft Office 365的SMTP電子郵件

Question

我在Exchange Online服務上有一個郵件帳戶。現在，我想測試，如果我能夠通過C＃應用程序發送郵件給客戶（在varoius域和微軟的Office 365）

我試圖執行下面的代碼，但我得到的錯誤

「根據驗證 過程，遠程證書無效。」

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

string[] strToList = "abc@gmail.com"    
foreach (string strID in strToList) 
{ 
    if (strID != null) 
    { 
     mail.To.Add(new MailAddress(strID)); 
    } 
} 

mail.From = "demo@onmicrosoft.com"; 
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("demo@onmicrosoft.com", "mypassword"); 
client.Credentials = cred; 
client.Send(mail); 

請指教，如果我做錯了什麼。 非常感謝。

Answer 1

嘗試使用：

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

此代碼將允許你接受無效的證書。

Answer 2

的錯誤

SMTP服務器要求安全連接或客戶端是不是 認證。服務器響應是：5.7.1客戶端不是 認證

經常發生在關聯的用戶帳戶密碼過期或帳戶被鎖定時。嘗試在Active Directory中設置「永不過期的用戶密碼」，如果它不違反公司的密碼策略:)在使用o365 Exchange Online A/c進行測試時，發生在我身上。

Answer 3

這對我的作品（從source編輯）

ThreadPool.QueueUserWorkItem(t => 
      { 
       SmtpClient client = new SmtpClient("smtp.office365.com",587); 
       client.EnableSsl = true; 
       client.Credentials = new System.Net.NetworkCredential("xxx@yyy.com", "password"); 
       MailAddress from = new MailAddress("xxx@yyy.com", String.Empty, System.Text.Encoding.UTF8); 
       MailAddress to = new MailAddress("xxx@yyy.com"); 
       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

嘗試smtp.office365.com代替smtp.outlook.office365.com

Answer 5

在某些情況下，TLS認證在c＃中使用smtp.office365.com作爲SMTP可能會導致問題。 嘗試發送（MSG）語句（覆蓋.TargetName）之前以下行：

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

這一個對我的作品

Answer 6

這也是發送郵件最好的辦法。我在我的項目中嘗試過，工作正常。

SmtpClient client = new SmtpClient("smtp.office365.com", 587); 
     client.EnableSsl = true; 
     client.Credentials = new System.Net.NetworkCredential("From@mail.com", "sdsd@12345"); 
     MailAddress from = new MailAddress("From Address Ex From@mail.com", String.Empty, System.Text.Encoding.UTF8); 
     MailAddress to = new MailAddress("From Address Ex To@mail.com"); 
     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);