Milter-greylist

"Javier" <axioma@...> writes:

> do this server authenticate each other in anyway?

not really, peers know about others and accept updates from others
thru TCP.

> 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?

for greylist sync between two milters, there is no notion of primary
or secondary. MXes shall only keep their list sync'ed.