[Dnsmasq-discuss] strange list server bounces
simon at thekelleys.org.uk
Tue May 8 21:17:34 BST 2012
On 08/05/12 20:58, starlight at binnacle.cx wrote:
> Another way to fix this if a sub-domain for
> the list server is aesthetically (or practically)
> more desirable, is to replace the CNAME record
> with explicit A and AAAA records.
The existence of the sub-domain for the list server is a fact on the
ground: I can't easily change that now even if I wanted to.
Agreed that explicit A and AAAA records would be better, except that the
A record is actually dynamic: it could (in theory) change at any time if
my ISPs DHCP server were to give me a new lease for a different address.
That's handled for thekelleys.org.uk by dyndns.org, but I don't want to
have the complication of keeping multiple A records up-to-date: I'm not
sure dyndns even supports that. The AAAA record is a real static address
(provided by a tunnel broker) but that doesn't help whilst the A record
> The presence of CNAME historically is stronger
> than permission to rewrite, rather it demands
> rewriting of the address. This makes logical
> sense as CNAME is primarily intended for migrating
> from one DNS name to another--not so much
> as an alias mechanism. However newer MTAs
> apparently fail to comply properly so the
> rewrite is not always happening as it should.
Given how long this has taken to come to light, I suspect that most
don't. The MTA and mailman installation was new a few months back, the
previous one may have accepted list mail to thekelleys.org.uk, I don't
remember. At the very least it has been in this state for months and
possibly for years.
Anyway, thanks for the education. I've learned something new and it's
More information about the Dnsmasq-discuss