C# SMTP 无法在 Outlook.com 端口 587 上进行身份验证.“服务器响应为:5.7.1 客户端未通过身份验证" [英] C# SMTP fails to authenticate on Outlook.com, port 587. "The server response was: 5.7.1 Client was not authenticated"

问题描述

我正在尝试发送自动电子邮件(真正需要的商业原因 - 不是垃圾邮件！).与以下类似的代码用于与另一个邮件服务提供商合作，但客户已转移到outlook.com".他们现在得到:

I'm attempting to send automated emails (genuinely required business reason - not spam!). Code similar to that below used to work with another mail service provider but the customer has moved to "outlook.com" and they're now getting:

    The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated

这个(C#)代码肯定可以工作:

Surely this (C#) code should work:

    private void Send_Click(object sender, EventArgs e)
    {
        MailMessage message = null;
        try
        {
            message = new MailMessage(From, To);
            message.Subject = "Update Request Session from " + From;
            message.CC.Add(Cc);
            message.Body = "Test message: please ignore.";
            message.IsBodyHtml = false;

            SmtpClient client = new SmtpClient("smtp.outlook.com", 587);
            client.Credentials = new System.Net.NetworkCredential(From, Password);
            client.UseDefaultCredentials = false;
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.EnableSsl = true;
            
            client.Send(message);
        }
        catch (Exception ex)
        {
            Status.Text = ex.Message;
        }
        
        if (message != null)
        {
            message.Dispose();
        }
    }

请注意 DeliveryMethod 和 EnableSsl 正在设置，并且端口是 587.

Please note the DeliveryMethod and EnableSsl are being set and that the port is 587.

我在我的 Outlook 客户端(桌面程序，而不是 Web 服务)上创建了另一个测试帐户来测试上面代码使用的参数:

I've created another test account on my Outlook client (the desktop program, not the web service) to test the parameters which the code above uses:

• 用户名
• 密码
• smtp.outlook.com
• 587
• TLS

和测试帐户设置"在 Outlook 中显示参数正确(任务:发送测试电子邮件 - 状态:已完成").所以我认为用户名和密码一定是正确的.

and the "Test Account Settings" in Outlook shows that the parameters are correct ("Task: Send test e-mail message - Status:Completed"). So I think the user name and password must be correct.

我已打开详细登录，如下所述:http://social.msdn.microsoft.com/Forums/en-US/netfxnetcom/thread/28b5a576-0da2-42c9-8de3-f2bd1f30ded4/.这产生了大量的输出，太多了，无法在此处发布.这是最后几行:

I've turned on verbose logging on as described here: http://social.msdn.microsoft.com/Forums/en-US/netfxnetcom/thread/28b5a576-0da2-42c9-8de3-f2bd1f30ded4/. This has produced a plenty of output, too much to post here. Here are the last few lines:

System.Net Information: 0 : [6312] SecureChannel#28756230 - Remote certificate was verified as valid by the user.
System.Net.Sockets Verbose: 0 : [6312] Socket#59109011::Send()
System.Net.Sockets Verbose: 0 : [6312] Data from Socket#59109011::Send
System.Net.Sockets Verbose: 0 : [6312] 00000000 : 17 03 01 00 30 4B BC 72-D3 A8 D7 EC FB 3C 21 0F : ....0K.r.....<!.
System.Net.Sockets Verbose: 0 : [6312] 00000010 : D7 BA A2 1F 72 1D D0 E6-4B DB 9A EC 9E 70 FD BC : ....r...K....p..
System.Net.Sockets Verbose: 0 : [6312] 00000020 : 73 B9 CC 6A 11 9E 32 E0-B2 47 D7 35 C0 BA CD DE : s..j..2..G.5....
System.Net.Sockets Verbose: 0 : [6312] 00000030 : 38 CA F6 93 8E                                  : 8....
System.Net.Sockets Verbose: 0 : [6312] Exiting Socket#59109011::Send()  -> 53#53
System.Net.Sockets Verbose: 0 : [6312] Socket#59109011::Receive()
System.Net.Sockets Verbose: 0 : [6312] Data from Socket#59109011::Receive
System.Net.Sockets Verbose: 0 : [6312] 00000000 : 17 03 01 00 D0                                  : .....
System.Net.Sockets Verbose: 0 : [6312] Exiting Socket#59109011::Receive()   -> 5#5
System.Net.Sockets Verbose: 0 : [6312] Socket#59109011::Receive()
System.Net.Sockets Verbose: 0 : [6312] Data from Socket#59109011::Receive
System.Net.Sockets Verbose: 0 : [6312] 00000005 : 4D 6F 22 3C B8 A4 39 14-B0 FC B9 58 23 9A 26 70 : Mo"<..9....X#.&p
System.Net.Sockets Verbose: 0 : [6312] 00000015 : 89 52 B4 E1 8D 74 D6 23-5C 2B 7C 44 6E EB 1A F7 : .R...t.#+|Dn...
System.Net.Sockets Verbose: 0 : [6312] 00000025 : 7A 56 3D 18 0E 93 9C C5-C6 43 28 25 AA 3D DF 89 : zV=......C(%.=..
System.Net.Sockets Verbose: 0 : [6312] 00000035 : 46 78 9B 69 ED FA 51 65-29 D9 DF A6 3F 9F 9F 25 : Fx.i..Qe)...?..%
System.Net.Sockets Verbose: 0 : [6312] 00000045 : 22 18 99 13 6A AA FB 49-BE 9C 53 F2 96 3C 5A 5A : "...j..I..S..<ZZ
System.Net.Sockets Verbose: 0 : [6312] 00000055 : 60 E1 23 FA CA 92 B9 4A-75 9D 87 D5 66 4D FB 84 : `.#....Ju...fM..
System.Net.Sockets Verbose: 0 : [6312] 00000065 : 99 63 D1 27 C9 41 90 C8-3D BE 82 E6 A2 62 EB 56 : .c.'.A..=....b.V
System.Net.Sockets Verbose: 0 : [6312] 00000075 : 5E D0 ED 67 B3 67 FD 6A-B0 99 34 07 DA 88 3D 02 : ^..g.g.j..4...=.
System.Net.Sockets Verbose: 0 : [6312] 00000085 : 2E E6 E5 DB 4F E7 C0 EF-A9 AD 01 C0 5D FE 94 19 : ....O.......]...
System.Net.Sockets Verbose: 0 : [6312] 00000095 : 92 0A 0E 6F C3 C7 F5 62-E4 15 F2 6D 56 A4 5B 74 : ...o...b...mV.[t
System.Net.Sockets Verbose: 0 : [6312] 000000A5 : C0 7A 2F 16 A7 F2 C0 F8-F4 90 00 EB DB 52 90 85 : .z/..........R..
System.Net.Sockets Verbose: 0 : [6312] 000000B5 : ED FA C6 91 5A 32 49 4A-9F F9 1D 11 62 97 C7 DC : ....Z2IJ....b...
System.Net.Sockets Verbose: 0 : [6312] 000000C5 : 96 11 67 E0 95 D2 95 0C-D9 41 C9 81 F8 4C 58 0F : ..g......A...LX.
System.Net.Sockets Verbose: 0 : [6312] Exiting Socket#59109011::Receive()   -> 208#208
System.Net.Sockets Verbose: 0 : [6312] Socket#59109011::Send()
System.Net.Sockets Verbose: 0 : [6312] Data from Socket#59109011::Send
System.Net.Sockets Verbose: 0 : [6312] 00000000 : 17 03 01 00 40 45 FD 20-1F 27 A1 B3 50 A3 99 5D : ....@E. .'..P..]
System.Net.Sockets Verbose: 0 : [6312] 00000010 : F3 DA 03 7E 47 C4 8C 91-21 7F 25 7C 09 CC E4 68 : ...~G...!.%|...h
System.Net.Sockets Verbose: 0 : [6312] 00000020 : 27 95 BE C7 FB 9E BC 65-67 64 CE C7 BE 4A BB 48 : '......egd...J.H
System.Net.Sockets Verbose: 0 : [6312] 00000030 : 89 36 A4 A4 90 B4 7B B4-C0 B5 DB 5B 18 3F 4A C3 : .6....{....[.?J.
System.Net.Sockets Verbose: 0 : [6312] 00000040 : A2 DB 51 B5 46                                  : ..Q.F
System.Net.Sockets Verbose: 0 : [6312] Exiting Socket#59109011::Send()  -> 69#69
System.Net.Sockets Verbose: 0 : [6312] Socket#59109011::Receive()
System.Net.Sockets Verbose: 0 : [6312] Data from Socket#59109011::Receive
System.Net.Sockets Verbose: 0 : [6312] 00000000 : 17 03 01 00 40                                  : ....@
System.Net.Sockets Verbose: 0 : [6312] Exiting Socket#59109011::Receive()   -> 5#5
System.Net.Sockets Verbose: 0 : [6312] Socket#59109011::Receive()
System.Net.Sockets Verbose: 0 : [6312] Data from Socket#59109011::Receive
System.Net.Sockets Verbose: 0 : [6312] 00000005 : 43 8E E7 44 71 B3 84 BC-5F 08 39 CE B1 3A A4 F9 : C..Dq..._.9..:..
System.Net.Sockets Verbose: 0 : [6312] 00000015 : F4 92 BE B3 D7 10 81 14-B9 5B BA E3 35 93 34 12 : .........[..5.4.
System.Net.Sockets Verbose: 0 : [6312] 00000025 : AF 32 F1 69 82 BD B9 8B-4C 2F 47 5F 8B 95 7E 52 : .2.i....L/G_..~R
System.Net.Sockets Verbose: 0 : [6312] 00000035 : 94 4C A6 79 6A F6 E2 84-D1 9E A5 D3 16 98 44 E1 : .L.yj.........D.
System.Net.Sockets Verbose: 0 : [6312] Exiting Socket#59109011::Receive()   -> 64#64
System.Net Error: 0 : [6312] Exception in the SmtpClient#44419000::Send - The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated
System.Net Error: 0 : [6312]    at     System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response)
   at     System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from)
   at     System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
   at     System.Net.Mail.SmtpClient.Send(MailMessage message)
System.Net.Sockets Verbose: 0 : [6312] Socket#59109011::Dispose()
System.Net Verbose: 0 : [6312] Exiting SmtpClient#44419000::Send() 

这些行中的第一行向我表明 SmtpClient 和 outlook.com 已就要使用的加密协议达成一致，但其余部分对我来说意义不大，除非5.7.1 客户端未通过身份验证".行.

The first of those lines suggests to me that the SmtpClient and outlook.com have agreed on the encryption protocols to use, but the rest of it is means little to me bar the "5.7.1 Client was not authenticated" line.

有没有人在连接到 Outlook.com 时遇到过类似的问题?

Has anyone run into similar problems connecting to Outlook.com?

提前致谢.

罗斯

推荐答案

我知道这听起来很奇怪，但 AFAI 记得你应该在设置 Credentials 之前使用 UseDefaultCredentials = false.将您的代码更改为:

I know that it sounds weird but AFAI remember you should use the UseDefaultCredentials = false before setting Credentials. change your code to:

client.UseDefaultCredentials = false;    
client.Credentials = new System.Net.NetworkCredential(From, Password);

这篇关于C# SMTP 无法在 Outlook.com 端口 587 上进行身份验证.“服务器响应为:5.7.1 客户端未通过身份验证"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！