From: Nolly Unvala 

Never mind, I'm a dolt!  I was confused by my multiple sessions and I was
issuing the test telnet command on the linux box (I work on the linux box
remotely via ssh/vnc)!

Nolly Unvala wrote:
> Hi everyone,
>
> I finally blew off W2K server on one of my home machines and replaced it
> with Linux this past weekend.  I installed Mandrake 10.1 first to take a
> look-see and then replaced it with Centos which I liked better mainly
> because I was able google for answers far more easily with it.  I've
> managed to get Apache2 installed and working quite nicely and spent the
> last couple of days getting Qmail, Courier-imap, Squirrelmail etc up and
> running.  I'm hoping to replace my current mail server, Mdaemon on
> another windows box, with this one.
>
> Since a couple of my users are on ISP's that block outgoing port 25, I
> had Mdaemon configured to accept SMTP via the ODMR port 366 which worked
> just fine.  I thought I could do that on the linux box using iptables
> (which I haven't quite deciphered yet).
>
> I issued the following command which I thought should redirect all
> traffic for port 366 to port 25, but it doesn't work (and yes, I opened
> port 366 in the /etc/services file):
>
> iptables -t nat -I PREROUTING -p tcp --dport 366 \-j REDIRECT --to-port 25
>
> Am I misreading the iptables docs?

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