[Info-vax] Decuserve.org - Anyone know why it's down?

[Bill Gunshannon]

In article <00AF0CC5.B67E7944 at sendspamhere.org>,
	VAXman-  @SendSpamHere.ORG writes:
> In article <ch07s0F7i9pU3 at mid.individual.net>, bill at server3.cs.scranton.edu (Bill Gunshannon) writes:
>>In article <00AF0C71.35A9A1A4 at sendspamhere.org>,
>>	VAXman-  @SendSpamHere.ORG writes:
>>> In article <ch01i5F5rgqU1 at mid.individual.net>, bill at server3.cs.scranton.edu (Bill Gunshannon) writes:
>>>>In article <00AF0C69.FA2DB1D5 at sendspamhere.org>,
>>>>	VAXman-  @SendSpamHere.ORG writes:
>>>>> In article <cgvsc6F3j6iU5 at mid.individual.net>, bill at server3.cs.scranton.edu (Bill Gunshannon) writes:
>>>>>>In article <m8a72d$sl0$1 at dont-email.me>,
>>>>>>	Stephen Hoffman <seaohveh at hoffmanlabs.invalid> writes:
>>>>>>> On 2015-01-04 01:17:20 +0000, Simon Clubley said:
>>>>>>> 
>>>>>>>> On 2015-01-03, Stephen Hoffman <seaohveh at hoffmanlabs.invalid> wrote:
>>>>>>>>> 
>>>>>>>>> FWIW, the decuserve.org DNS resolution has been re-targeted.  The 
>>>>>>>>> domain is now resolving to a different, Boston-area IP address.
>>>>>>>>> 
>>>>>>>> 
>>>>>>>> What IP address are you seeing and what do you think the last IP address was ?
>>>>>>> 
>>>>>>> I reversed it back to an IP address that indicated it was a Verizon 
>>>>>>> FiOS static, which AFAIK / AFAICR is new.   IIRC, the old address 
>>>>>>> didn't reverse back to FiOS.  If not, "nevermind".
>>>>>> 
>>>>>>I hope that's going to change as it will definitely affect who the users
>>>>>>can send email to.
>>>>> 
>>>>> Why do you say that?
>>>> 
>>>>Many (one would hope most, if not all) proper MTA's will look at the entry
>>>>in the HELO (or EHLO) command in SMTP and attempt to match it to the DNS PTR
>>>>value.  If they don't match it is assumed the contacting MTA is spoofing
>>>>and will be rejected.
>>> 
>>> Again, why?  If FioS provides a static IP, then there should also be some
>>> way to provide DNS lookups for that static IP.  What good would static IP
>>> be without it??? 
>>> 
>>
>>Sigh....
>>
>>
>>server1# nslookup
>>
>>> set q=A
>>
>>> decuserve.org
>>
>>Non-authoritative answer:
>>Name:   decuserve.org
>>Address: 96.252.127.67
>>
>>
>>
>>> set q=PTR
>>
>>> 67.127.252.96.in-addr.arpa.
>>
>>Non-authoritative answer:
>>67.127.252.96.in-addr.arpa      name = static-96-252-127-67.bstnma.fios.verizon.net.
>>
>>Authoritative answers can be found from:
>>127.252.96.in-addr.arpa nameserver = ns7.verizon.net.
>>127.252.96.in-addr.arpa nameserver = ns5.verizon.net.
>>127.252.96.in-addr.arpa nameserver = ns8.verizon.net.
>>127.252.96.in-addr.arpa nameserver = ns6.verizon.net.
>>
>>
>>The A record is looked up based on the name which is registered to
>>Connect Worldwide, Inc. and so their nameserver is used.
>>
>>But the PTR record is looked up using the numeric IP address and that
>>points to servers run by Verizon Online LLC.
>>
>>This is the same problem run into by people using things like dyndns.
>>
>>Here's one (sanatized) taken directly from my servers maillog.
>>
>>Jan  5 00:05:22 mailhost postfix/smtpd[49341]: NOQUEUE: 
>>reject: RCPT from 67.107.123.196.ptr.us.xo.net[67.107.123.196]: 
>>450 4.7.1 <mia-p-mail-01.int.ppcit.net>:
>>Helo command rejected: Host not found; from=<xxxxxxx at pagepluscellular.com>
>>to=<xxxxxx at cs.uofs.edu> proto=SMTP helo=<mia-p-mail-01.int.ppcit.net>
>>
>>Note that while the "helo" matches the name presented by the sending
>>MTA (line 3) it does not match the PTR Record (line 2) and the email
>>is rejected.
>>
>>It ain't rocket science but running a proper email server is harder
>>than most people seem to think.  And if more of them were run properly
>>SPAM would rapidly disappear.
> 
> That's failure to setup the reverse lookup; not a problem with static IP.
 
No kidding.  And that is what one sees with decuserve.org.  And, at
least for email, it makes the static IP useless.

bill

-- 
Bill Gunshannon          |  de-moc-ra-cy (di mok' ra see) n.  Three wolves
billg999 at cs.scranton.edu |  and a sheep voting on what's for dinner.
University of Scranton   |
Scranton, Pennsylvania   |         #include <std.disclaimer.h>