DOCUMENT:Q161943 18-MAY-2001 [exchange] TITLE :XFOR: RFC822 Header Includes BCC Recipients Fields PRODUCT :Microsoft Exchange PROD/VER:4.0 OPER/SYS: KEYWORDS:kbusage ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Exchange Server, version 4.0 - the operating system: Microsoft Windows NT 4.0 - the operating system: Microsoft Windows 95 ------------------------------------------------------------------------------- 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 , 22 bytes SMTP: Rsp: Requested mail action okay, completed, 29 bytes SMTP: Cmd: Recipient , 33 bytes SMTP: Rsp: Requested mail action okay, completed, 45 bytes SMTP: Cmd: Recipient , 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 SMTP: Data = To: "test@microsoft.com'" SMTP: Data = Bcc: "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 ====================================================================== Keywords : kbusage Technology : kbWinNTsearch kbWinNTSsearch kbWin95search kbExchangeSearch kbExchange400 kbZNotKeyword2 kbWin95 Version : 4.0 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.