>> I'll argue that whichever it is, it is also a mis-feature.
> 
> Right. The "problem" is in the way how signing is implemented in the 
> transport (redirecting the SMTP DATA output stream to an extra fd). 
> While it would be possible to chain both functions, performance would 
> really suffer. I'd need to merge both functions and calculate both 
> hashes at the same time.  I can't promise any progress before end of 
> next week though.
> 
>> Besides presenting a use-case and rationale, as I've just done, what can
>> I do to help?
> 
> Play the guinea pig with a tarball that I'll send over. :)

OK, it took me a bit longer. I've put code in CVS that enables 
concurrent Domainkeys and DKIM signing. Here's a snapshot tarball:

http://duncanthrax.net/exim-experimental/exim-cvssnap-2008-03-05.tar.gz

/tom


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