"David Chadwick" wrote:

> Hi,
>
> Our firewall currently forwards port 25 to a spam filter server, which
> then forwards it on to the gateway of our Mail server infrastructure
> (Exchange).
>
> We are in the process of replacing our spam filter with a new product
> (changing from MailMarshal to SurfControl Email Filter).
>
> The powers that be have decided that they would like to run both
> systems in parallel for a while. By this they mean that the mail will
> flow through BOTH systems so that we can compare what spam the new
> system identifies compared to the old system. The old system would
> still forward the mail on to our gateway, while the new system will
> forward the mail to nowhere (we just need to see whether it identified
> it as spam or not).
>
> This could be achieved by placing another SMTP relay box in front of
> our current MailMarshal box, and have that SMTP relay box forward all
> SMTP messages to both servers. We run a Windows 2003 shop so the
> obvious question is: Can this be done with the SMTP server in IIS? I
> can't see a way.
>
> If not, does anyone know of a product that can do it (preferrably
> Windows based)?
>
> I know I can put systems in place that will BCC all messages to a
> special mailbox, but that isn't quite the same as allowing the mail to
> flow through both systems "untouched".
>
> Any ideas?
>
> Thanks,
> David