best spam filter port(s) for postfix?

[Pollywog]

On Sunday 30 September 2007 20:28:23 Derek Ragona wrote:
> At 03:20 PM 9/30/2007, Joe in MPLS wrote:
> >I'm running 6.2-STABLE with postfix with cyrus-sasl, imap-uw & horde for
> >mail. I'd like to stop depending on clients(Thunderbird & PDAs) for
> >primary spam control (especially because our PDAs don't do any). AV
> >scanning would be a plus too.
> >
> >                ...jgm
>
> I use mailscanner with sendmail which uses spamassasin with clamav.  All
> from the ports.

I used Mailscanner at one time, but it is not recommended for use with Postfix 
because mail can be lost.  It never happened to me, but it has happened to 
others.  I believe the Postfix website mentions these problems.