Re: Any postfix+dspam experts out there?

[Niall O'Reilly <Niall.oReilly+netbsd%no8.be@localhost>]

On Fri, 15 Jan 2016 07:33:10 +0000,
Paul Goyette wrote:
> 
> Actually, I have a good reason for using a backup-MX - the primary
> mail server is only reachable via IPv6.  It is "hidden" behind an
> IPv4-only NAT box.  Connectivity between the primary and backup MX
> machines is via an openvpn tunnel, running IPv6-over-IPv4 (the IPv6
> address range is globally visibile and routable).

  Do you actually need an MTA on the backup server?  This could run
  a proxy/port-forwarder/load-balancer service to redirect the SMTP
  session to the primary, leaving you with just one MTA to manage.

  Best regards,
  Niall O'Reilly