RE: The subject line leakage problem

["Housley, Russ" <rhousley@xxxxxxxxxxxxxxx>]

Ned:

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.

Russ

At 09:28 AM 12/18/2001 -0800, ned.freed@xxxxxxxxxxx wrote:
> > The subject line issue is not a problem in the X.400 world.  SMTP
carries
> > 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 
> content.
>
>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
>end.




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