On Nov 5, 2009, at 15:52, Eric B. wrote:
"Eric B." <ebe...@hotmail.com> wrote in message
news:hcupsk$b8...@ger.gmane.org...
"Victor Duchovni" <victor.ducho...@morganstanley.com> wrote in
message
news:20091104232940.gi27...@np305c2n2.ms.com...
On Wed, Nov 04, 2009 at 06:16:56PM -0500, Eric B. wrote:
Is there no way to direct Postfix to a different DNS server (as
opposed
to
the ones specified in resolve.conf) either for a particular
domain, or
for
all domains altogether?
If you chroot-jail the smtp(8) delivery agent, it will use the
resolv.conf
file in the chroot jail. This is ugly, you are probably solving the
wrong problem.
Interesting thought. I agree that this is somewhat ugly, but might
be
something worth investigating...
Ok - now I am very confused. I tried setting up Postfix in a chroot
jail,
and specified a different set of nameservers in
/var/spool/postfix/etc/resolv.conf. However, it seems as though
Postfix
continues to use the name servers specified in /etc/resolv.conf and
not the
ones in the chroot jail.
I have gone so far as to create an empty /var/spool/.../resolv.conf
with no
nameservers specified, and yet postfix is still able to deliver the
email
(to the wrong server). I would have expected that leaving the
nameservers
blank would have caused Postfix to choke, and yet it still connects.
I definitley have chroot set to Y in my master.cf file, and have
done a
postfix restart. I do get a warning on restart that
postfix/postfix-script: warning: /var/spool/postfix/etc/resolv.conf
and
/etc/resolv.conf differ
Or does the fact that they differ cause the chroot to fail, and the
process
ends up running in regular mode instead?
I have gone as far as deleting the /var/spool/postfix/lib and lib64
directories, and postfix still starts without any error messages.
And when
I try to mail something, it still manages to send the mail. So that
gives
me confirmation that the chroot isn't working properly.
Apart from setting chroot to y in master.cf, is there anything else
I have
to do to enable it properly?
Thanks,
Eric,
Getting back to your original goal, my understanding is that the
original goal is to override the DNS "A" record for a single host,
yes? If so, that is a perfect use for /etc/hosts. Give that method a
try.
Daniel
