Re: OT: Most clueless ISP award?

In comp.os.linux.misc Moe Trin <ibuprofin@xxxxxxxxxxxxxxxxxxxxxx>:
On Sat, 23 Dec 2006, in the Usenet newsgroup comp.os.linux.misc, in article
<ot7u54-ahd.ln1@xxxxxxxxxxxxxxx>, Michael Heiming wrote:

In comp.os.linux.misc Jan Sevelsted
<NOsevelstedSPAM@xxxxxxxxxxxxxxxxxxxxxxxx>:

The Natural Philosopher wrote:

John-Paul Stewart wrote:

The Natural Philosopher wrote:

521 This system is configured to reject mail from 80.168.244.139

RIPE says that 80.168.244.0/24 is static IPs for Clara.net ADSL customers.
A host lookup vaguely confirms that.

So it looks like mail.lanset.com blocks the entirety of clara.net.

If that were the case, why is it picking that specific IP address out of
the hat? Clara.net mail servers are in the 80.168.70.0/24 range.

It also blocks at least one other ISP completely, as i got a friend to
check it from his.

And not just from .de - TDC, one of Denmark's largest ISP's has a
blockage (at least on the IP I currently hold).

Indeed, they block Europe, Africa and probably other places
completely despite a few hand selected machines. At least I found
2 MTA that would work, despite being located in Germany.

Just curious - what IP _range_ (/16)? Germany has 25 IP blocks assigned

Sorry but I can't tell you, being the admin of one of them.
Though those seem hand selected single IPs allowed to send, not
ranges.

out of ARIN (in addition to the 1873 from RIPE) nearly all in /16s that
www.iana.org/assignments/ipv4-address-space says are ARIN (very vaguely
implying a North American location).

I am still amazed they get away with it, though spam is a big
problem, there are more intelligent ways to deal with...

That depends. If they have no reasonable expectation of receiving mail
from country X, or region Y, or planet Z, they may feel that the block
is an acceptable alternative. The company I work for has an interesting

Don't think so, while this may work out for some small setup with
few users it is hardly imaginable it would for some large ISP
with zillions of customer or some worldwide operating company?

DNS setup, such that queries from Europe are given the MX addresses of our
European office, while hosts in Asia get either the Chinese, Japanese,
or Singapore facility addresses as appropriate, and so on. To the best of
my knowledge, the US MX addresses only accept mail from North America.
This is mainly a service decision - there are more German speakers/readers
(for example) in our European office than at the US main office. It also
relates to 'time-of-day'.

Interesting.

--
Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
mail: echo zvpunry@xxxxxxxxxx | perl -pe 'y/a-z/n-za-m/'
#bofh excuse 268: Neutrino overload on the nameserver
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