C# 为什么我没有收到交付状态电子邮件中的原始信封Id标题？

我正在用netframework 4.7用c#创建两个桌面应用程序。在一个应用程序中，我通过smtp向365的outlook服务器发送邮件，在另一个应用程序中，我通过imap读取邮件

我正在使用的是的MailKit库，我正在跟踪答案，因为我对处理邮件传递状态的应用程序感兴趣。我的问题是，在交付状态电子邮件中，我没有收到原始信封Id标题

那么我做错了什么呢？outlook服务器上是否缺少此配置？库中是否缺少配置

目前我的课程是这样的：

发送邮件的类和方法：

public class EnvioDeCorreo {
    private const string Usuario = "miusuario@outlook.com";
    private const string Password = "mipass";
    private const string Host = "smtp.office365.com";

    public async Task Enviar() {
        var message = new MimeMessage();
        message.From.Add(new MailboxAddress("PrFq", Usuario));
        message.To.Add(new MailboxAddress("usu1", "usu1@gmail.com"));
        message.To.Add(new MailboxAddress("notvalid", "notvalid.notvalid@notexist.com"));
        // Adding others mailbox's

        message.Subject = "Hola de envio desde c#";
        message.Body = new TextPart("plain") {
            Text = "Hola desde c#"
        };

        using (var client = new DSNSmtpClient(new ProtocolLogger("DSNSmtpClient.log"))) {
            client.MessageSent += this.OnMessageSent;
            await client.ConnectAsync(Host, 587, SecureSocketOptions.StartTls);
            await client.AuthenticateAsync(Usuario, Password);

            if (client.Capabilities.HasFlag(SmtpCapabilities.Dsn))
                Debug.WriteLine("Soporta DSN");
            else return;

            await client.SendAsync(message);
            await client.DisconnectAsync(true);
        }

    }

    private void OnMessageSent(object sender, MessageSentEventArgs e)
        => Debug.WriteLine($"En MessageSent {e.Response}");
}

public class DSNSmtpClient : SmtpClient {
    public DSNSmtpClient(ProtocolLogger protocolLogger) : base(protocolLogger) { }
    protected override string GetEnvelopeId(MimeMessage message) => message.MessageId;
    protected override DeliveryStatusNotification? GetDeliveryStatusNotifications(MimeMessage message, MailboxAddress mailbox)
        => DeliveryStatusNotification.Failure | DeliveryStatusNotification.Success;

查阅电子邮件的班级：

public class ManejoDeEstadoDeCorreo {
    private const string Usuario = "miusuario@outlook.com";
    private const string Password = "mipass";
    private const string Host = "outlook.office365.com";

    public void Manejar() {
        using (var client = new ImapClient(new ProtocolLogger("ImapClient.log"))) {
            client.Connect(Host, 993, true);
            client.Authenticate(Usuario, Password);

            var inboxFolder = client.Inbox;
            inboxFolder.Open(FolderAccess.ReadOnly);
            var query = SearchQuery.SubjectContains("Hola de envio desde c#");
            var uids = inboxFolder.Search(query);
            foreach (var uid in uids) {
                var message = inboxFolder.GetMessage(uid);
                this.ValidarEstado(message);
            }

            client.Disconnect(true);
        }
    }

    private void ValidarEstado(MimeMessage message) {
        var report = message.Body as MultipartReport;
        if (report != null && report.ReportType != null 
            && report.ReportType.Equals ("delivery-status", StringComparison.OrdinalIgnoreCase)) {
            foreach (var mds in report.OfType<MessageDeliveryStatus>()) {
                var statusGroup = mds.StatusGroups[0];
                var envId = statusGroup["Original-Envelope-Id"];
                if (envId is null) {
                    // It is here where the header is null.
                    Debug.WriteLine("Not working");
                } else {

                }
            }
        }
    }
}

公共类manejodestatodecorreo{
私有const字符串Usuario=”miusuario@outlook.com";
private const string Password=“mipass”；
private const string Host=“outlook.office365.com”；
公共空间{
使用（var client=new ImapClient（new ProtocolLogger（“ImapClient.log”））{
client.Connect（主机，993，true）；
客户端身份验证（通常是密码）；
var inboxFolder=client.Inbox；
inboxFolder.Open（FolderAccess.ReadOnly）；
var query=SearchQuery.SubjectContains（“Hola de envio desde c#”）；
var uids=inboxFolder.Search（查询）；
foreach（uids中的变量uid）{
var message=inboxFolder.GetMessage（uid）；
这是ValidarEstado（信息）；
}
client.Disconnect（true）；
}
}
私有void ValidarEstado（MimeMessage消息）{
var report=message.Body作为MultipartReport；
如果（report！=null&&report.ReportType！=null
&&report.ReportType.Equals（“交付状态”，StringComparison.OrdinalIgnoreCase））{
foreach（report.OfType（）中的var mds）{
var statusGroup=mds.StatusGroups[0]；
var envId=statusGroup[“原始信封Id”]；
if（envId为空）{
//这里的头是空的。
Debug.WriteLine（“不工作”）；
}否则{
}
}
}
}
}

反弹邮件中的internet标题为：

Received: from CY1NAM02HT029.eop-nam02.prod.protection.outlook.com
 (2603:10b6:5:3b5::33) by DM5PR0201MB3527.namprd02.prod.outlook.com with HTTPS
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To: <marlonedu.pe@outlook.com>
Date: Thu, 11 Feb 2021 15:16:00 +0000
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References:
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Subject: Undeliverable: Hola de envio desde c#
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ARC认证结果：i=2；mx.microsoft.com 1；spf=通过（发送方ip为
40.92.21.103）smtp.rcpttodomain=outlook.com
smtp.helo=nam12-bn8-obe.outbound.protection.outlook.com；dmarc=通过（p=无
sp=隔离pct=100）操作=无标题。from=outlook.com；dkim=无
（信息未签名）；弧=通过（0 oda=0 ltdi=1）
收到：来自CY1NAM02FT053.eop-nam02.prod.protection.outlook.com
（10.152.74.51）由CY1NAM02HT029.eop-nam02.prod.protection.outlook.com发布
（10.152.75.100）与Microsoft SMTP服务器（版本=TLS1_2，
cipher=TLS_ECDHE_RSA_和_AES_256_GCM_SHA384）id 15.20.3846.25；2月11日星期四
2021 15:16:01 +0000
验证结果：spf=通过（发送方IP为40.92.21.103）
smtp.helo=NAM12-BN8-obe.outbound.protection.outlook.com；outlook.com；
dkim=none（消息未签名）头。d=none；outlook.com；dmarc=通过
action=none header.from=outlook.com；compauth=通过原因=100
已收到SPF:Pass（protection.outlook.com:domain of
NAM12-BN8-obe.outbound.protection.outlook.com将40.92.21.103指定为
允许的发件人）收件人=protection.outlook.com；客户ip=40.92.21.103；
helo=NAM12-BN8-obe.outbound.protection.outlook.com；
收到：从NAM12-BN8-obe.outbound.protection.outlook.com（40.92.21.103）收到
CY1NAM02FT053.mail.protection.outlook.com（10.152.74.165）和Microsoft SMTP
服务器（版本=TLS1\U 2，密码=TLS\U ECDHE\U RSA\U，带AES\U 256\U GCM\U SHA384）id
15.20.3846.25通过前端运输；2021年2月11日星期四15:16:01+0000
X-IncomingTopHeaderMarker：
原始检查：244D9E6BC8291DDF78648CCA252564A1C19DE8A7F27715FAF27887E37E532；大写检查：F0829C4E3FEAB9CC01A8A79EC1D2E0F80219EB3B9B12FB967A7C4D7F10CA7EA1；收到的数字：2800；计数：26
电弧密封：i=1；a=rsa-sha256；s=arcselector9901；d=微软网站；cv=无；
2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 R7H4MJP/IJm3uM7RA==
ARC报文签名：i=1；a=rsa-sha256；c=放松/放松；d=微软网站；
s=arcselector9901；
h=From:Date:Subject:Message ID:Content Type:MIME Version:X-MS-Exchange-SenderADCheck；
bh=bntYEMMAxsEqgCcoJ8/KQp1p8eLqi9xVUMW+EQarFKg=；
b=mB8rKCmo3w2ORP45sAF6W9mVK+3tD6w94Tzk3drve5eSWtRf