[Dnsmasq-discuss] Wildcard / catch all Mail eXchanger (MX)

Mark dnsmasq at resimplify.net
Sat May 8 12:44:56 UTC 2021


Thanks for the suggestion Petr - have put a DNAT rule in place - does the
job. :)


On Sat, 8 May 2021 at 06:33, Petr Menšík <pemensik at redhat.com> wrote:

> Hi Mark,
>
> I don't think there exists way to do what you requested using dnsmasq.
>
> However, it might work to DNAT rule outgoing SMTP connections to your
> smarthost, moving this decision from DNS to IP firewall/NAT. Could be
> done only on some gateway of course.
>
> But I think your users would not like such redirection, I think blocking
> outgoing ports and requesting manual configuration from clients might be
> more acceptable. Just my 2 cents.
>
> Cheers,
> Petr
>
> On 5/7/21 4:05 PM, Mark wrote:
> > Hi,
> >
> > I know there are MX related configuration options which can be used in
> > dnsmasq.conf (mx-host, mx-target, selfmx and localmx) - however, none of
> > them appear to be able to deliver the specific functionality I'm looking
> > for...here's what I'm trying to do...
> >
> > I have an internal network that is using dnsmasq for name resolution and
> > some (not all) hosts are using it for DHCP.
> >
> > I would like dnsmasq to deliver a single MX record back to MX queries
> from
> > hosts on my internal network no matter what mail domain is being included
> > in their MX query - i.e. a 'wildcard MX' (which I'll point to my SMTP
> > smarthost).
> >
> > The description of the 'mx-host' option in dnsmasq's man page makes
> > reference to this type of requirement ("for directing mail from systems
> on
> > a LAN to a central server") - however, dnsmasq still appears to need to
> be
> > configured to provide responses only for specifically mail domains
> > ("hostname") MX requests.
> >
> > Essentially, I believe I want to specify a wildcard as the "hostname"
> > (really "mail domain").
> >
> > I wondered if it's possible to deliver this functionality with the
> current
> > dnsmasq?
> >
> > Appreciate any insights you're able to share.
> >
> > Thanks in advance.
> >
> > Mark
> >
> >
> > _______________________________________________
> > Dnsmasq-discuss mailing list
> > Dnsmasq-discuss at lists.thekelleys.org.uk
> > https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
> >
>
> --
> Petr Menšík
> Software Engineer
> Red Hat, http://www.redhat.com/
> email: pemensik at redhat.com
> PGP: DFCF908DB7C87E8E529925BC4931CA5B6C9FC5CB
>
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