On Mon, 3 Nov 2008, Erik Lotspeich wrote:
> I'll give an example.  Presumably, the mbox "sent" mail file contains the
> message sent to the MTA.  That looks similar to this:
>
> To: [EMAIL PROTECTED], [EMAIL PROTECTED],
>  [EMAIL PROTECTED],
>  [EMAIL PROTECTED], [EMAIL PROTECTED]
>
> The received message (in which verification failed) is folded differently:
>
> To: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED],
>       [EMAIL PROTECTED], [EMAIL PROTECTED]

As mentioned, the sendmail MTA does rewrite some headers in order to get 
them to fold nicely.  This code is old, added back when such reformatting 
for aesthetic reasons didn't break anything and was in fact desirable for 
presentation reasons.  Obviously it has ill effects now, but this wasn't 
anticipated back then.

Version 2.8.0 will have a new FFR feature which attempts to predict this 
rewriting and canonicalize the header fields as if the rewriting had 
already been done.  It's still experimental but might alleviate some 
stress in some environments.

I'm about to post a new beta release of 2.8.0 which contains the first 
draft of this code, should you be interested in trying it out.  Subscribe 
to the dkim-milter-beta list if interested, and watch for the release 
announcement.

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