RE: FW: postfix and root dns zones

> Wietse Venema
>
> Matt Taylor:
> > By lab environment I have:
> >
> > a pseudo-dmz which has postfix in it, internal to the dmz
> an exchange
> > server, external to the dmz another exchange server that also has
> > windows dns on it.
> >
> > ALL of the above is on an enclosed LAN with NO access to
> the internet.
> >
> > After setting up my dns (correctly?!?) but without having postfix
> > 'involved' mail flow between the 2 exchange servers is fine.
> >
> > By adding postfix into the equation and letting that do the
> relaying
> > mail gets queued at the postfix box UNTIL I make my dns
> server a root
> > server, effectively adding a '.' zone.
> >
> > Seeing as this is my first foray into this area my big
> question is why
> > does exchange work without dns having root zones, but postfix does
> > not? I'm not slating the technology at all (god forbid I would ever
> > put Microsoft technology above anything, i've been using a mac for
> > years now and use postfix on it as my mail relay), just interested.
>
> If you can get me a Microsoft source code license then I will
> be happy to figure out why they can send mail without root DNS server.

It's very simple: Exchange doesn't talk RFC 821 SMTP protocol, but instead
its own mechanisms.

To be able to send mail to Internet, Exchange has sort of SMTP connector
IIRC. And this connector surely needs RFC 1034/5-compatible Domain Name
System.

The same apply to Lotus Notes I guess.


Andrzej Kukula