That and I use a spooling service that performs "partial" 
greylisting.  Those two things cut my spam by nearly 2/3's.  I also 
quarrantine embedded and linked images and went through the process 
of whitelisting people who typically post with them.  I also loaded 
into my whitelist all the list admin email addresses, and whitelisted 
a couple of domains that post a lot to many of the lists.  I can send 
you copies of my blocks as well if you are interested.

John

At 12:36 PM 3/20/2007, you wrote:
>We put the 'cuda at our border instead of just the Listserv server
>itself and it greatly reduced the amount of spam that was being sent to
>the lists from external.
>
>   Bob
>
> > -----Original Message-----
> > From: LISTSERV site administrators' forum [mailto:LSTSRV-
> > [log in to unmask]] On Behalf Of Anne Toal
> > Sent: Tuesday, March 20, 2007 8:56 AM
> > To: [log in to unmask]
> > Subject: A Listserv behind a spam firewall
> >
> > We recently put up a Barracuda spam firewall and I would like to know
>if
> > anyone out there has compiled best practices for running a Listserv in
> > that
> > way.
> >
> > Yes, I know the Listserv has anti-spam protection. However on lists
>that
> > are
> > set up to send all posts to a moderator, it appears to ignore whether
> > the
> > message is spam and it sends the message approval requests anyway. I
> > would
> > like to use the Barracuda to stop those as well.
> >
> > The Barracuda can suppress daily spam summary messages, so we wouldn't
> > have
> > to worry about a daily summary message going to the members of all the
> > lists. It can also send the daily spam summary messages to a specific
> > address. Does anyone have experience with either configuration? How
>well
> > did
> > it work?
> >
> > Does anyone have any methods that don't involve using an external
> > antispam
> > firewall to stop these unwanted approval requests full of spam?
> >
> > -aht