Re: SPF records and DKIM signatures on ubuntu/postfix/mailman

On 14/10/11 20:04, Volker Kuhlmann wrote:
> On Fri 14 Oct 2011 15:09:37 NZDT +1300, Mark Foster wrote:
>
>> ... or simply use dig -x.
> No, not good enough unless you use a DNS server *other* than your ISP's.
>
> E.g. my Telstra cable IP gives a valid response (albeit a .in-addr.arpa
> one) in the normal situation (where the ISP's DNS is configured), but
> returns NXDOMAIN when using opendns.
>
>

As far as the world is concerned the IP you're on does _not_ have a
valid forward/reverse pair, based on the headers of the last message you
sent to the list anyway.

The fact it works inside of TCL only is actually broken, and I'd suggest
that you raise it with TCL.
For comparison, the earlier forward/reverse pair I posted are also on
TCL and work fine.

Checking your DNS works outside of the authoritive/hosting server is
something that you should always do anyway, if the means presents.  Many
ISPs are now blocking external lookups for security reasons, swapping
shells with someone on a different ISP can be very useful for diagnostic
purposes.

Cheers
Mark.



A response from within .in-addr.arpa usually means the PTR zone is
subdelegated below the /24 which require

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