Milter-greylist

--- In milter-greylist@yahoogroups.com, Kai Schaetzl <maillists@...>
wrote:

A single database server will be able to handle a significant number
of single domain mx servers. If that is not enough, the next step up
will be a high performance, high availability database cluster. These
type of clusters have multiple points of entry. This is much like how
a http://www.google.com request is directed to one of many web
servers. From the standpoint of milter-greylist interfacing with the
database, there is very little difference between connecting to a
simple SQL server, or a large cluster. Hence the scalability of the db
model.

> As for using a "central" DBMS for better scaling. I fear this will
somehow 
> bite itself in the tail. If you have a larger cloud of mail servers
that 
> means you also have a *lot* of mail traffic and you were required to 
> cluster it to cope with that. Now going to a single DBMS backend means 
> "re-introducing" a single point of possible slowdown and failure. So,