Wietse Venema:
> Stan Hoeppner:
> > On 12/15/2011 8:19 AM, /dev/rob0 wrote:
> >
> > > The old default of most MUAs to use port 25 was wrong, and it is now
> > > coming back to haunt you. That said, you have workarounds:
> > >
> > > - Use a different IP address for port 25 MX and submission mail
> >
> > If *all* your MUAs submitting to TCP 25 are on a known internal subnet,
> > such as corporate network desktops, the fix is even easier as it
> > requires no MUA reconfiguration. The following assuming your Postfix
> > server is Linux.
>
> [iptables]
>
> Or simply list the clients in mynetworks.
No, this redirects client from the MTA port (with postscreen)
to the MUA port (with submission service).
Wietse
