SA-Exim Greylist IP Whitelist?

I've been using SA-Exim for sometime now (very happy with it) and have just
recently began using the greylisting feature.  I've read that there are
certain services (like Gmail, etc) that should have their IPs exempted from
greylisting.  Is there a way in sa-exim to exclude certain IP addresses just
from greylisting, or do I have to exclude sa-exim from running on them at
all using the X-SA-Do-Not-Run headers?

Thanks for any help!

Jeff

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