Re: Configuring Exim for mail delivery
[Some snipping. Not too much, I hope].
On Sun 02 Oct 2016 at 01:05:20 +0100, Liam O'Toole wrote:
> On 2016-10-01, Brian <ad44@cityscape.co.uk> wrote:
> >
> > Exim's default behaviour, as has been mentioned a couple of times in
> > this thread, is to use DNS; nsswitch is not involved.
>
> Doing an strace on the exim command shows that /etc/nsswitch is
> consulted first, then /etc/resolv.conf (followed by a DNS lookup of the
> smarthost).
This is what I cannot get round. I'm prepared to accept that my
understanding may be defective but when I see "driver = dnslookup" in
router/200_exim4-config_primary it fits what I observe. Which is why I
use a hubbed_hosts file to manually route mail to machines on the LAN.
> > This is a default
> > exim install; no files in conf.d altered. How about you?
>
> No alterations I can remember, and 'dpkg --verify' reports no changes to
> exim4-related files. All customisations have been done via debconf. I am
> reluctant to divulge those customisations here, but I can tell you that
> the settings are not particularly exotic. One host on the local network
> is configured to use my ISP's SMTP server as its smarthost, while the
> other hosts in turn use the former as their smarthost.
I have the same setup and all customisations (apart from hubbed_hosts)
have been done via debconf. TBH, I cannot see why /etc/hosts should be
consulted because I thought there is first a check for an MX record and
then an attempt to resolve the host *using the DNS* if there was none.
Your instructions are clear so I can continue to try more customising
via debconf.
mo appears to have had no more success than I have. Don't know about
Mark.
--
Brian
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