Hi Mark,
At 09:21 21-11-2007, Mark Martinec wrote:
>Investigating why a DKIM signature (relaxed/simple) occasionally breaks
>on mail to one of our users but not for the rest, it turned out his mail
>was being forwarded internally by a sendmail MTA running on a workstation,
>while others were delivered directly (through Postfix).
>
>The particular type of message that breaks is generated by a Eudora MUA,
>which does not insert spaces after commas in a To: header field.
>Forwarding (or delivering to a mailbox) through sendmail (tried 8.14.2,
>8.14.2, 8.13.3) gratuitously inserts a space after commas in a list,
>which is not tolerated even by a 'relaxed' canonicalization in DKIM.

I reported the problem in March 2007.  The transformation also occurs 
if you use multiple addresses without spaces in the Cc: field.  I 
haven't tested the behavior in 8.14.x.

Regards,
-sm 


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