無法使用c＃中的smtp發送電子郵件＃

Question

我希望我的系統在單擊按鈕時發送電子郵件，但是我每次都會在smtp.send（消息）中發現問題，沒有任何錯誤或任何內容，它只是雖然它仍然在運行，但它仍然凍結。我寫了4次嘗試，都不成功。

1日嘗試：

try 
{ 
    MailMessage mail = new MailMessage(); 
    SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com"); 

    mail.From = new MailAddress("robinx0852@gmail.com"); 
    mail.To.Add("robinx0852@gmail.com"); 
    mail.Subject = "Test Mail"; 
    mail.Body = "This is for testing SMTP mail from GMAIL"; 

    SmtpServer.Port = 25; 
    SmtpServer.Credentials = new System.Net.NetworkCredential("username", "password"); 
    SmtpServer.EnableSsl = true; 

    SmtpServer.Send(mail); 
    MessageBox.Show("mail Send"); 
    MessageBox.Show("Email sent successfully"); 
} 
catch (Exception ex) 
{ 
    MessageBox.Show(ex.Message); 
} 

第2次嘗試：

try 
{ 
    //string s = $"User {edtID} has failed to login"; 

    MailMessage message = new MailMessage(); 
    message.To.Add("robinx0852@gmail.com"); 
    message.Subject = "Employee login failure"; 
    message.From = new MailAddress("armeepatel@gmail.com"); 
    message.Body = "Hello"; 
    SmtpClient smtp = new SmtpClient("smtp.saix.net"); 
    smtp.Send(message); 
    MessageBox.Show("mail Sent"); 
} 
catch (Exception ex) 
{ 
    MessageBox.Show(ex.Message); 
} 

SmtpClient smtp = new SmtpClient(); 
smtp.Port = 25; 
smtp.Credentials = new System.Net.NetworkCredential("username", "password"); 
smtp.EnableSsl = true; 
MailMessage mailMessage = new MailMessage(); 
mailMessage.To.Add(new MailAddress("mymail@gmail.com", "ME")); 
mailMessage.Subject = "Some Subject"; 
mailMessage.Body = "Test"; 
smtp.Send(mailMessage); 

第三嘗試：

// string s = $"User {edtID} has failed to login"; 
MailMessage mail = new MailMessage(); 
SmtpClient SmtpServer = new SmtpClient(); 
mail.To.Add("mymail@gmail.com"); 
mail.From = new MailAddress("hotelfrontdesk@testhotel.com"); 
mail.Subject = "Employee login failure"; 
mail.IsBodyHtml = true; 
mail.Body = "Hello"; 
SmtpServer.Host = "smtp.saix.net"; 
SmtpServer.Port = 25; 
SmtpServer.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network; 
try 
{ 

    SmtpServer.Send(mail); 
} 
catch (Exception ex) 
{ 
    MessageBox.Show("Exception Message: " + ex.Message); 
    if (ex.InnerException != null) 
     MessageBox.Show("Exception Inner: " + ex.InnerException); 

} 

第四嘗試：

var sysLogin = "yourlogin@gmail.com"; 
var sysPass = "y0urP@ss"; 
var sysAddress = new MailAddress(sysLogin, "Message from me!"); 

var receiverAddress = new MailAddress("mymail#gmail.com"); 

var smtp = new SmtpClient 
{ 
    Host = "smtp.gmail.com", //gmail example 
    Port = 587, 
    EnableSsl = false, 
    DeliveryMethod = SmtpDeliveryMethod.Network, 
    UseDefaultCredentials = false, 
    Credentials = new System.Net.NetworkCredential(sysLogin, sysPass) 
}; 


using (var message = new MailMessage(sysAddress, receiverAddress) { Subject = "Some subject", Body = "Some text" }) 
{ 
    smtp.Send(message); 
} 
MessageBox.Show("Success"); 

Answer 1

你試過嗎？看起來你所有的嘗試都有SSL + 25或587 + NoSSL。 SSL應與端口587

var smtpClient = new SmtpClient("smtp.gmail.com") 
{ 
       Port = 587, 
       DeliveryMethod = SmtpDeliveryMethod.Network, 
       UseDefaultCredentials = false, 
       EnableSsl = true, 
       Credentials = new NetworkCredential("Myemail@gmail.com", "MyPassword") 
}; 

Answer 2

我曾經有一個問題，我的電子郵件客戶端將凍結上使用STMP設置Gmail時發送郵件。然後，我必須在Gmail帳戶設置中創建應用程序密碼，並在stmp設置中使用該應用程序密碼才能使我的客戶端正常工作。試試這個，希望它修復凍結問題

1. 轉到https://security.google.com/settings/security/apppasswords
2. 選擇和應用[自定義，如果有的話]，設備[自定義，如果有的話]，然後點擊生成。
3. 將生成一個類似如下的密碼：kxyo gmnz dais wcau
4. 使用此應用程序密碼而不是您現在在stmp設置中使用的密碼。