consolidate the two data_post methods into one (more linear, simpler)
more informative log message
add new headers to top of headers (not bottom (consistent MTA behavior))
refactored into small subs with unit tests.
parse SA header with split instead of regexp (more reliable)
store SA results in a 'spamassassin' transaction note
add strict and warnings pragma
renamed reject_threshold -> reject (backwards compatible)
added relayclient skip option and POD. Skips SA processing when relayclient is set
added MULTIPLE RECIPIENT BEHAVIOR topic to POD
