我已经做了一些研究，并且还使用Microsoft Exchange Server 2010进行了一些代码测试，以实现在退回的电子邮件中，标题正在被删除。我提到的其中一篇文章是：Detecting bounced messages by return-path header。
我遇到的问题是尝试从退回的电子邮件中检索自定义标题，但根据我的研究，这似乎是不可能的。上面文章中提到的另一个解决方案是使用返回路径地址。
但是，当我使用Microsoft Outlook Web App访问我的Web电子邮件，并检查退回到我的地址的电子邮件时，我能够查看原始邮件标题。那么，是否可以使用EWS托管API来检索原始邮件头？
原始邮件标题如下：
Diagnostic information for administrators:
Generating server: MXG001.domain.com
email.that.do.not.exist.1234567890@gmail.com
gmail-smtp-in.l.google.com # #SMTP#
Original message headers:
Return-Path: sender@domain.com
Received: from MXG001.domain.com (unknown [127.0.0.1]) by IMSVA (Postfix)
with ESMTP id 1484C26805C for ;
Wed, 29 Aug 2012 20:07:56 +1000 (EST)
Received: from EZY106 (unknown [10.32.8.141]) by MXG001.domain.com
(Postfix) with ESMTP id 6F7B026805B for
email.that.do.not.exist.1234567890@gmail.com; Wed, 29 Aug 2012 20:07:55
+1000 (EST)
Reply-To: myemail@domain.com
X-CustomHeader1: 0E591306-9997-4E35-954E-F36A069AF8B4
X-CustomHeader2: 1F80DCBF-2F93-49A4-90C0-00E79763B916
MIME-Version: 1.0
Sender: domain sender@domain.com
From: myemail@domain.com
To: email.that.do.not.exist.1234567890@gmail.com
Date: Wed, 29 Aug 2012 18:10:13 +0800
Subject: Test e-mail tracking 3
Content-Type: text/html; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
Message-ID: 20120829100755.6F7B026805B@MXG001.domain.com
X-TM-AS-MML: No
X-TM-AS-Product-Ver: IMSVA-8.2.0.1520-6.8.0.1017-19146.000
X-TM-AS-Result: No--0.146-5.0-31-10
X-imss-scan-details: No--0.146-5.0-31-10
X-TM-AS-User-Approved-Sender: No
X-TMASE-Version: IMSVA-8.2.0.1520-6.8.1017-19146.000
X-TMASE-Result: 10--0.146400-5.000000
X-TMASE-MatchedRID: wjdoQEOKyrZ7ahiNncA4hJpaQZrxtVBsqS91SjnldFIi7hIFpWx7pqbF
sETXF+9u5V8fgkZZSCU19vcvk7TH/S8xkUATmhC45BgEdUqqANSV8bCk1I9WfnXA+T8YcZkDP/i
gW2j9KQ2dtSjAL+46o1q6LJohGEOtW5fzCBTKbRONes9LMglhgLejw9iqfGUKR0givuLhSAhBg2
NqmDTb6Q+gzceqIagHXcAUO5rYRMutSn//sy4xSbAVy0FQT/1xloKBPsyyeoXpAAWYDGUZn3OxN
uYzUrAfNmDrdAkjVfe9KhpQKnl6nw==
我使用下面的代码编写一个客户端来访问EWS，它也可以正常工作。 所以我唯一的问题是，是否可以检索原始邮件标题？如果是这样，我该怎么办？谢谢！
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
service.Credentials = new WebCredentials(@"myUsername", "myPassword");
service.Url = new Uri("https://webmail.domain.com/ews/exchange.asmx");
Folder inbox = Folder.Bind(service, WellKnownFolderName.Inbox);
SearchFilter sf = new SearchFilter.IsEqualTo(ItemSchema.ItemClass, "REPORT.IPM.Note.NDR");
SearchFilter searchFilter = new SearchFilter.SearchFilterCollection(LogicalOperator.And, new SearchFilter[] { sf });
ItemView view = new ItemView(20);
FindItemsResults<Item> findResults = service.FindItems(WellKnownFolderName.Inbox, searchFilter, view);
foreach (EmailMessage item in findResults)
{
// Can process whatever is necessary here
}