Milter-greylist

Hi,

  I just implemented the multiple mx feature of milter-greylist on 4
servers, but I have a few questions:

  1- Do I have to put all 4 mx servers in greylist.conf or only the "3
others"?

  2- There is one servers that doesn't seem to work:

- grep mxsync /var/log/maillog returns nothing (while all other
servers do return many syncs)

[root@server2 root]# netstat -an | grep 5252
tcp        0      0 0.0.0.0:5252                0.0.0.0:*            
      LISTEN
tcp        0      0 server2:49417        server1:5252         ESTABLISHED
tcp        0      0 server2:49415        server4:5252          
ESTABLISHED
tcp        0      0 server2:49416        server3:5252           
ESTABLISHED

[root@server4 root]# netstat -an | grep 5252
tcp        0      0 0.0.0.0:5252                0.0.0.0:*            
      LISTEN
tcp        0      0 server4:5252           server1:35182       
ESTABLISHED
tcp        0      0 server4:5252           server2:49415       
ESTABLISHED
tcp        0      0 server4:5252           server3:50223          
ESTABLISHED


On the servers that work ok, I can see this kind of record in my logs:

Dec 11 14:15:37 gateway4 milter-greylist: Incoming MX sync connexion
from 10.10.10.10

But all I can find on server2 is 

Dec 11 15:07:38 gateway2 milter-greylist: Connection to x.x.x.x
established

What should I try next?

Thanks,

Ugo