On Tue, 11 Dec 2007, SM wrote:
> The milter would have to emulate sendmail's behavior on signing.

...which is unfortunately non-trivial to achieve.  sendmail was written at 
a time when pretty-izing a message was acceptable, or in fact even 
preferred, behaviour for an MTA.  Unfortunately DKIM is an application 
where that feature is rather undesirable.

In addition to these rewrites, we've already added provisional code to 
dkim-filter for space-after-colon munging and things like the "masquerade" 
and "genericstable" features.  There are probably others we've not yet 
encountered.

The easiest thing to do is sign your headers with "relaxed" 
canonicalization, as someone else has already suggested.  That tolerates 
all of these space-rewriting modifications the MTA does.

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