Re: Problems with mail system? [Fwd: Returned mail: User unknown]
On Thu 07 Sep 2000, Hamish Moffatt wrote:
> On Thu, Sep 07, 2000 at 12:55:07AM -0500, Joseph Carter wrote:
> > On Wed, Sep 06, 2000 at 11:37:55PM -0400, email@example.com wrote:
> > > yes. get an ISP that can do reverse DNS. YEESHHH! I'll happily bounce
> > > their mail until then.
> > Are you willing to pay the difference between the cost of that user's
> > current ISP and one which meets your standard? Until then, you have
> > absolutely no right to tell someone what ISP they should use.
> In any case, reverse DNS lookup is reasonable, no matter what you think
> of DUL.
I have to agree with this. The previous time, the discussion was
using DUL to block email. This is about reverse DNS lookups
failing, which is a completely different this. If the reverse
DBS lookup fails, you either have a grossly incompetent ISP(*) or
a malicious one.
(*) Try this for size:
Default Server: localhost
> set type=mx
deanmoor.nl preference = 10, mail exchanger = mail.deanmoor.nl
Authoritative answers can be found from:
deanmoor.nl nameserver = ns01.deanmoor.nl
deanmoor.nl nameserver = ns02.deanmoor.nl
mail.deanmoor.nl internet address = 126.96.36.199
ns01.deanmoor.nl internet address = 188.8.131.52
ns02.deanmoor.nl internet address = 184.108.40.206
> set type=a
*** localhost can't find 220.127.116.11: Non-existent host/domain
*** localhost can't find 18.104.22.168: Non-existent host/domain
*** localhost can't find 22.214.171.124: Non-existent host/domain
It used to be a different scenario:
mail.deanmoor.nl -> 126.96.36.199 -> www.deanmoor.nl ->
188.8.131.52 -> unknown
I contacted them about this (a couple of times), but they were convinced
that their setup was correct. They also tried to convince me that I
misunderstood the problem. Yeah, right.
I recommended my client to go elsewhere for internet connectivity.
He did, and now knows that it is possible to have a reliable internet
connection. He now also pays in excess of US$1000 a year _less_ for it.
home: firstname.lastname@example.org http://www.wurtel.demon.nl/
work: email@example.com http://www.murphy.nl/
debian: firstname.lastname@example.org http://www.debian.org/
isdn4linux: email@example.com http://www.isdn4linux.de/
To UNSUBSCRIBE, email to firstname.lastname@example.org
with a subject of "unsubscribe". Trouble? Contact email@example.com