DomainKeys will list the header fields that are signed.  Adding a field (such 
as Subject: if it did not already exist) will not break the signature.  It will 
just be considered an +ACI-unverified+ACI- header field and have no impact on 
the message.

This is the same process as adding +ACI-Received:+ACI- headers without breaking 
DomainKeys.

- Jason J Ellingson

----- Original Message -----
From:    +ADw-bugzilla-daemon+AEA-bugzilla.spamassassin.org+AD4-
Subject: +AFs-Bug 3605+AF0- rewrite+AF8-header will not rewrite a missing header
Date:    Tue, 26 Oct 2004 12:07:23 -05:00

http://bugzilla.spamassassin.org/show+AF8-bug.cgi?id+AD0-3605





------- Additional Comments From felicity+AEA-kluge.net  2004-10-26 10:07 
-------
Subject: Re:  rewrite+AF8-header will not rewrite a missing header

On Tue, Oct 26, 2004 at 09:14:14AM -0700, 
bugzilla-daemon+AEA-bugzilla.spamassassin.org wrote:
+AD4- Theo - the argument that the user should get a better MUA does not hold 
water -

If you read the discussion comments, you'll notice that I never said they
should change MUAs.  What I said (comment +ACM-4) was that we shouldn't add
previously non-existing message headers just because the end user's MUA
can only filter on +ACI-Subject+ACI-.


As far as SA is concerned, I'm somewhere between:

a) we should not go adding standard headers (such as Subject) if they don't
   already exist.  Can we even do this with things like DomainKeys?

and

b) we should rewrite all of the headers -- add the Subject if necessary, fix
   non-RFC compliant Content-Type headers, etc, etc.  basically make the
   output from SA less likely to cause issues +ACI-downstream+ACI-.





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