Article ID: 161943 - Last Review: October 28, 2006 - Revision: 3.3 XFOR: RFC822 Header Includes BCC Recipients FieldsThis 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
The following is a sample network monitor trace:
message. The contents of this field are not included in copies of the message sent to the primary and secondary recipients.
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
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