Milter-greylist

> But milter-greylist will be of little benefit if you have a
> secondary MX without greylisting

i am planning on changing my secondary MX server
to a linux platform.

in the README file it says something about using peer in
the config file so that MX server sync using port 5252.

do this server authenticate each other in anyway?
or they just ask for a MX record (doing some dns query,
i suppose) to recognise they are primary and secondary
server of the same domain?

javier