Add support for DKIM signing
Check for debug=true specifically
Expand on basic exim conf & add dkim variables
Add DKIM info to README
Add dkim dependency to setup.py
add pointer to launchpad for setuptools
Use different syntax for versioned dependencies
Use simple c10n for body - google doesn't like relaxed.
Call out over-quota failures separately.
Fix an undeclared variable
Teach the SES sender to strip out headers that AWS doesn't like
update SES allowed header list
split up and sort DKIM used header list
more useful logging
don't throw away headers when sanitizing

Silently eating headers is bad, transform them into informational X-headers,
instead.
handle missing DEBUG environmental variable
make dependencies work
documentation updates
move to newest dkimpy sources
quota exhaustion is temporary