Milter-greylist

Hello list,

First post here.
I have two MXes for the same domains and their greylist.conf have their
peer configured :

Host 1 :

    peer 192.168.148.53

Host 2 :

    peer 192.168.148.11

Yet they don't seem to sync at all. There is no firewalling between
these two hosts, and I can see that the milter-greylist process is
successfully binding on 0.0.0.0:5252.
But their respective greylist.db are not the same, and I can't see any
traffic between them on TCP port 5252.

Could there be something missing here ?

My milter-greylist version is 4.5.12 on both sides.

    Thank you !

        Hoggins!