Outlook SMTP Oauth发送-身份验证失败 [英] Outlook SMTP Oauth Send - Authentication Unsuccessful

问题描述

我一直在尝试使用 Microsoft示例项目.

沿着那条路线，我添加了SMTP.Send和许多其他API权限来查找丢失的部分. (包括{ "User.Read", "User.ReadBasic.All", "SMTP.Send", "offline_access", "Mail.Send" }，因为它怕丢失一个)

Along that route I have added SMTP.Send and many other API permissions to find the missing piece. (Including { "User.Read", "User.ReadBasic.All", "SMTP.Send", "offline_access", "Mail.Send" } in fear of missing one)

我一直在使用 MailKit库进行测试，以建立概念证明.

I have been testing with the MailKit library to build a proof of concept.

到目前为止，我的以下代码段在尝试进行身份验证后失败.

So far I have the following Code Snippet that fails after trying to authenticate.

public void SendSmtpMessageAsync(string id, string accessToken)
{
    var message = new MimeMessage();
    message.From.Add(new MailboxAddress("From Name", "From [e-mail]"));
    message.To.Add(new MailboxAddress("To Name", "To [e-mail]"));
    message.Subject = "How you doin'?";

    message.Body = new TextPart("plain")
    {
        Text = @"Test Email Content"
    };

    using (var client = new SmtpClient(new ProtocolLogger(Console.OpenStandardOutput())))
    {
        try
        {
            client.Connect("smtp.office365.com", 587, SecureSocketOptions.StartTls);

            var oauth2 = new SaslMechanismOAuth2(id, accessToken);

            var temp = client.AuthenticationMechanisms;
            client.Authenticate(oauth2);

            client.Send(message);
            client.Disconnect(true);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex);
        }
    }
}

我已启用日志记录，并获得了一条日志，该日志显示客户端正在连接，而不是发送令牌进行身份验证，但身份验证失败.

I have enabled logging and gotten a log that shows the client connecting than sending the token to authenticate but the authentication failing.

Connected to smtp://smtp.office365.com:587/?starttls=always
S: 220 MW3PR05CA0003.outlook.office365.com Microsoft ESMTP MAIL Service ready at Mon, 25 May 2020 21:31:07 +0000
C: EHLO [192.168.0.7]
S: 250-MW3PR05CA0003.outlook.office365.com Hello [<<My IP>>]
S: 250-SIZE 157286400
S: 250-PIPELINING
S: 250-DSN
S: 250-ENHANCEDSTATUSCODES
S: 250-STARTTLS
S: 250-8BITMIME
S: 250-BINARYMIME
S: 250-CHUNKING
S: 250 SMTPUTF8
C: STARTTLS
S: 220 2.0.0 SMTP server ready
C: EHLO [192.168.0.7]
S: 250-MW3PR05CA0003.outlook.office365.com Hello [<<My IP>>]
S: 250-SIZE 157286400
S: 250-PIPELINING
S: 250-DSN
S: 250-ENHANCEDSTATUSCODES
S: 250-AUTH LOGIN XOAUTH2
S: 250-8BITMIME
S: 250-BINARYMIME
S: 250-CHUNKING
S: 250 SMTPUTF8
C: AUTH XOAUTH2 <<Token omitted but I have confirmed that it is Base64 encoded and 
in the format of base64("user=" + userName + "^Aauth=Bearer " + accessToken + "^A^A")>>
S: 535 5.7.3 Authentication unsuccessful [MW3PR05CA0003.namprd05.prod.outlook.com]
MailKit.Security.AuthenticationException: 535: 5.7.3 Authentication unsuccessful 
[MW3PR05CA0003.namprd05.prod.outlook.com]

任何方向或资源将不胜感激，因为大多数现有帖子来自2020年之前的传统SMTP支持.此外，如果您有任何误解，请告诉我，以便我进行一些补充阅读.

Any direction or resources would be appreciated since most existing posts are from pre-2020 when Legacy SMTP support was added. Additionally, if you see any misunderstanding let me know so I can do some additional reading.

推荐答案

我遇到了类似的问题，这是由于我对Microsoft 365的错误配置引起的.请参阅

I had a similar problem, which was cause by my misconfiguration of Microsoft 365. Please see MailKit unsuccessful SMTP OAuth with Microsoft 365 server for details. Hope this helps.

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