XFOR: RFC822 Header Includes BCC Recipients Fields (161943)


The information in this article applies to:

  • Microsoft Exchange Server 4.0
  • the operating system: Microsoft Windows NT 4.0
  • the operating system: Microsoft Windows 95
This article was previously published under Q161943

SYMPTOMS

The Microsoft Internet Mail Service for Windows 95 and Windows NT Server improperly sends the BCC recipients information in the RFC-822 header of the mail message. This causes all recipients of the message to see who was BCC'd on the mail message.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 4.0. This problem was corrected in the latest Microsoft Exchange 4.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

MORE INFORMATION

RFC-822 states the following about the BCC field:

This field contains the identity of additional recipients of the
message. The contents of this field are not included in copies of the
message sent to the primary and secondary recipients.

The following is a sample network monitor trace: 
   SMTP: Rsp: Service ready, 93 bytes
   SMTP: Cmd: Hello, host identifier, 28 bytes
   SMTP: Rsp: Requested mail action okay, completed, 69 bytes
   SMTP: Cmd: Mail from <TEST>, 22 bytes
   SMTP: Rsp: Requested mail action okay, completed, 29 bytes
   SMTP: Cmd: Recipient <TEST@microsoft.com>, 33 bytes
   SMTP: Rsp: Requested mail action okay, completed, 45 bytes
   SMTP: Cmd: Recipient <test2@microsoft.com>, 31 bytes
   SMTP: Rsp: Requested mail action okay, completed, 43 bytes
   SMTP: Cmd: Data: Mail data to follow, 6 bytes
   SMTP: Rsp: Enter mail ..., 50 bytes
   SMTP: Data - continued from frame 16, 480 bytes
      SMTP: Data = Received: by test.microsoft.com with Microsoft Mail
      SMTP: Data = id <01BC18F8.ED1DCB00@test.microsoft.com>;
      SMTP: Data = Message-ID: <01BC18F8.ED1DCB00@test.microsoft.com>
      SMTP: Data = From: Test <test>
      SMTP: Data = To: "test@microsoft.com'" <test@microsoft.com>
      SMTP: Data = Bcc: "test@microsoft.com'" <test@microsoft.com>
      SMTP: Data = Subject:
      SMTP: Data = Date: Wed, 12 Feb 1997 15:23:47 -0800
      SMTP: Data = MIME-Version: 1.0
      SMTP: Data = Content-Type: text/plain; charset="us-ascii"
      SMTP: Data = Content-Transfer-Encoding: 7bit
Modification Type:MinorLast Reviewed:4/28/2005
Keywords:kbbug kbfix kbusage KB161943
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