Hi Michael,

> Hi, folks.  We'd like to use iptables on a SL 3.x box to redirect 
> incoming email messages to a central spam/virus-filter system, where 
> it would be scanned and, possibly, sent back to the SL box.
> 
> I.e., iptables has to accept mail from the spam/virus-filter box,
>  but re-vector all other email TO the spam/virus-filter box.
> 
> It looks as if the DNAT option is what we want, but we haven't been 
> able to make this work.
> 
> If you have this working, would you please contact me directly?  Thanks.

Wouldn't it be easier to MX inbound mail to the central spam/virus-filter
system and then deliver "clean" mail to the relevant servers? (which can be
the SL box).

Michael.