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RE: The subject line leakage problem

2001-12-18 11:18:31


Thanks for correcting the details.

RFC 822 defines a header, which is clearly outside the SMTP envelope.  The 
RFC 822 header is separated from the content by a blank line.  The subject 
line is before this blank line, so it cannot be protected by a content 
encapsulation protocol.

Sorry for any confusion that may have resulted from the loose terminology 
in my first message.


At 09:28 AM 12/18/2001 -0800, ned(_dot_)freed(_at_)mrochek(_dot_)com wrote:
The subject line issue is not a problem in the X.400 world.  SMTP
the subject line is in the envelope.

On the contrary, in SMTP the subject field is part of the content, not part
of the envelope. Specifically, it is part of the message header.

The corresponding X.400 protocols
(P1, P3, and P7) do not.  In X.400, the subject line is part of the 

This part is correct, but it fails to get at the reason why X.400 and SMTP
differ in their ability to protect the entire content of a message end to

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