opendkim wasn't signing email which was processed by milter-greylist in sendmail

this page offered the solution:
i removed this line from
define(`confMILTER_MACROS_ENVFROM', `i, {auth_authen}')
rebuild, and now opendkim sees the smtp client as authenticated and signs outgoing email when it should
i see:
DKIM-Signature header added
instead of: [#.#.#.#] not internal
opendkim[9294]: qxxx: not authenticated
opendkim[9294]: qxxx: no signature data

-- linux_macosx_hints_etc page