[pmwiki-users] Re: [OT] Strange list DNS issues
Patrick R. Michaud
pmichaud at pobox.com
Sat Mar 26 11:52:23 CST 2005
On Sat, Mar 26, 2005 at 11:08:42PM +1200, Robin wrote:
> What it looks like to me (assuming the problem isn't at my end) is that
> the DNS server(s) for pmichaud.com are sometimes flaking out and causing
> it to sit in my mail queue for ages. Given that it's staying in the queue
> and not being outright rejected makes it look like a temporary DNS error,
> such as servers not responding.
I've noticed as well that there are times when DNS for my domain(s)
doesn't seem to be responding well, I probably need to contact my
hosting service provider and ask them "what's up with that"? I
suspect the problem is there. If the problem continues I may need
to set up a secondary nameserver somewhere.
> However I'm not totally sure what a domain without a defined MX should
> return, except there is no authority section, which strikes me as a
> little odd.
Any domain that expects to receive mail should have an MX record
defined for it. I just checked and for some reason pmichaud.com
didn't have an MX record defined -- I don't know how/when that happened
but I've fixed it now. Thanks for bringing this to my attention!
> I'm also not sure why it isn't falling back to the A record
> (the mailserver is postfix, which is good one for doing the Right Thing,
> so that implies that something is happening that means that it
> shouldn't).
Many mail handlers default to an A record if an MX record is not
defined, but I remember reading somewhere that this behavior is
deprecated and that they aren't supposed to do this.
Thanks again,
Pm
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