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/usr/share/postgrey/postgrey-default is in postgrey 1.35-1.

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# postgrey startup options, created for Debian

# you may want to set
#   --delay=N   how long to greylist, seconds (default: 300)
#   --max-age=N delete old entries after N days (default: 35)
# see also the postgrey(8) manpage

POSTGREY_OPTS="--inet=10023"

# the --greylist-text commandline argument can not be easily passed through
# POSTGREY_OPTS when it contains spaces.  So, insert your text here:
#POSTGREY_TEXT="Your customized rejection message here"