Just to play Devils advocate...
There is a third address to be considered, the Reply-to. This is a specific
request from the originator of the message to reply to another address. If it
is present we ought not reply to either of the other 2 addresses.
25 Molesworth Street
From: phoffman [SMTP:phoffman(_at_)imc(_dot_)org]
Sent: Tuesday, February 15, 2000 12:01 AM
Subject: Re: Problem for public CAs
At 04:10 PM 2/14/00 -0700, Bob Jueneman wrote:
Instead, in the case of a signed message the From address should be viewed
as secondary, and the certificate contents the primary information.
From a security standpoint, this is right. From a UI standpoint, it might
not be. Assume I have a different email address in my cert than in the
From: header of a message I send you, that your S/MIME client has informed
you of that, and you agreed. Now you want to reply to my message. You
probably don't want to reply to the email address in my cert, but you
might. There are essentially two From vales: the certificate one and the
Of course, we have to face the fact that NEITHER the DN nor the RFC822 address
may be particularly relevant or informative.
And, no, I'm not proposing a solution here.
--Paul Hoffman, Director
--Internet Mail Consortium