Re: FW: postfix and root dns zones

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2004-02-26T10:25:58 Matt Taylor:
> 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.

This doesn't surprise me. Exchange is only sort of an email system,
and Microsoft is not, shall we say, famous for understanding and
correctly implementing internet standards. No doubt Exchange can
work without any DNS at all.

Postfix, on the other hand, is an internet MTA; DNS is the name
service used for email routing, period.

Postfix doesn't particularly care about root zones as such; it just
wants working DNS. For each domain it's trying to route to, it wants
to be able to do MX lookups for the bits on the right side of the
"@" in the address. This can be suppressed; you can hardwire routing
into the transport table, and that might suffice for a simple lab
setup where postfix simply stands between two other servers.

But if you don't want to do that, you need to have working DNS.
Working DNS almost requires a root zone. It's certainly simplest and
best for you to create one.

If for some reason you want to see how it can work without it, you
can arrange for your recursive resolver to explicitly forward every
zone you need to have to a content server authoritative for that
zone. It's icky, but possible.

-Bennett

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