Matt Savigear writes:
Scanning the list archives leads me to believe that there is no way for any filtering component to access the original content of an incoming message's envelope. Is this correct?
Not quite -- the courierfilter interface does have access to the message's control file, and the envelope sender can be fished out from there.
For stuff invoked from .courier (which includes maildrop), the envelope stuff can be found in the environment variables (dot-courier man page).
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