Milter-greylist

These error started to appear when I added another MX and set a peer
entry in greylist.conf on both machines, and idea what they mean?  There
is no firewall between these machines.

Sep 24 10:35:35 smtp1 milter-greylist: [ID 699817 mail.info] Connection
to 64.232.128.5 established Sep 24 10:35:35 smtp1 milter-greylist: [ID
421412 mail.error] Unexpected reply "200" from 10.0.0.10, closing
connexion (137 entries queued) Sep 24 10:35:35 smtp1 milter-greylist:
[ID 421412 mail.error] Unexpected reply "200" from 10.0.0.10, closing
connexion (137 entries queued) Sep 24 10:35:35 smtp1 milter-greylist:
[ID 421412 mail.error] Unexpected reply "200" from 10.0.0.10, closing
connexion (137 entries queued) Sep 24 10:35:35 smtp1 milter-greylist:
[ID 421412 mail.error] Unexpected reply "200" from 10.0.0.10, closing
connexion (137 entries queued)

I see the same errors on both machines.  I'm running milter-greylist
1.4, I've tried 1.5.8 but it seems to sync with it's peer once or twice
then give up and not sync anymore.
	-James