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Question

儘管在Stackoverflow上有關於此的所有主題。我不能設法找到這一問題的解決方案：

我有這樣的例外：

SMTP服務器需要安全連接或客戶端是不是 authentificated。服務器的回覆是：5.5.1認證 必需。瞭解更多信息，使用此代碼

：

var fromAddress = new MailAddress(user.Email, "From Name"); 
    var toAddress = new MailAddress("myadress@gmail.com", "To Name"); 
    const string fromPassword = "fromPassword"; 
    const string subject = "Subject"; 
    const string body = "Body"; 

    var smtp = new SmtpClient 
    { 
     Host = "smtp.gmail.com", 
     Port = 587, 
     EnableSsl = true, 
     DeliveryMethod = SmtpDeliveryMethod.Network, 
     UseDefaultCredentials = false, 
     Credentials = new NetworkCredential(fromAddress.Address, fromPassword), 
     Timeout = 20000 
    }; 
    using (var message = new MailMessage(fromAddress, toAddress) 
    { 
     Subject = subject, 
     Body = body 
    }) 
    { 
     smtp.Send(message); 
    } 

我在想什麼嗎？ 感謝您的幫助

Answer 1

你不會錯過任何東西。我懷疑你的密碼錯了。你不忘記把它從「密碼」改爲它真的應該是你？

This is a cleaner implementation of the same task

Answer 2

此代碼爲我工作

SmtpClient sc = new SmtpClient("smtp.gmail.com"); 
    NetworkCredential nc = new NetworkCredential("username","password"); 
    //username doesn't include @gmail.com   
    sc.UseDefaultCredentials = false; 
    sc.Credentials = nc; 
    sc.EnableSsl = true; 
    sc.Port = 587; 
    try 
     { 
     sc.Send(mm); 
     } 
    catch (Exception ex) 
     { 
     EventLog.WriteEntry("Error Sending", EventLogEntryType.Error); 
     } 

Answer 3

或者您已輸入錯誤的密碼或（更可能），你要使用你的正常的密碼，您已經啓用了谷歌的2-Step Authentication

後

您需要生成並使用一個application specific password