Carrier class email security recommendation

Suresh Ramasubramanian ops.lists at
Mon Apr 12 11:28:16 CDT 2010

Scale it all.  Then manage it centrally. Provision users. Manage
security.  etc etc.

You use much the same IOS whether you run a router for a T1 or run
networks for a tier 1 :)

On Mon, Apr 12, 2010 at 9:51 PM, joel jaeggli <joelja at> wrote:
> I build basically the same mail-system where is collapsed into a single box
> or spread out across a cluster.
> sendmail + clamav milter + milter graylist -> procmail -> spamd -> maildir
> delivery -> dovecot imap.
> When you need to scale the front end you deploy a load balancer and fire up
> more smtp boxes...
> When you need to scale the filestore you move it to nfs and divide and
> conquer.
> When you need to scale imap you shift it in front of the load balancer and
> deploy more boxes.
> For load balancer we used LVS back in the day.
> can replace sendmail with postfix or exim, it's mostly a place to hang the
> various on-connect filter regimes.

Suresh Ramasubramanian (ops.lists at

More information about the NANOG mailing list