[Cialug] Administrivia

Sat Apr 9 10:26:35 CDT 2011

Well, it may not be an issue since your e-mail made it through to the list.

On Sat, Apr 9, 2011 at 10:01 AM, Matt <matt at itwannabe.com> wrote:

> Sorry, didn't mean to send to the list, and the iPod likes to hide who you
> are replying to.  Just to clarify, my mail server issue isn't Dave's fault,
> as I never told him where to point the PTR record.
>
> Matt, the IT Wannabe
> http://www.itwannabe.com/
>
> On Apr 9, 2011, at 9:33 AM, Matt <matt at itwannabe.com> wrote:
>
> > My server, hosted by Dave at Internet solver, doesn't resolve properly.
>  The only place this ever caused me problems was on craigslist, so I never
> bothered complaining about it.  I'll get in touch with Dave, but I doubt it
> will be solved before Monday.
> >
> > Matt, the IT Wannabe
> > http://www.itwannabe.com/
> >
> > On Apr 8, 2011, at 9:14 PM, Nicolai <nicolai-cialug at chocolatine.org>
> wrote:
> >
> >> Hello all,
> >>
> >> This is a long message but you can skip over it if the following items
> >> don't apply to you:
> >>
> >> 1. Forward-confirmed reverse DNS for your mailserver, which will soon be
> >> required for sending mail to cialug.org.  (Let me know if this applies
> >> to you!)
> >>
> >> 2. A description of small changes I've made to the cialug.org mail
> config.
> >>
> >> 3. Posts from non-subscriber addresses.  (Let me know if you do!)
> >>
> >> First, I want to remind folks that they will soon need to have proper
> >> DNS records for machines sending mail to cialug.org.
> >>
> >> Who this mainly applies to: people who run their own mail servers.  It
> >> should not affect many people.
> >>
> >> This requirement will apply only to DNS records, not to your mail server
> >> config.  And if you don't run your own mail server, it's exceedingly
> >> unlikely this applies to you at all.
> >>
> >> What this entails:
> >>
> >> This means having matching PTR and A records, also known as
> >> Forward-confirmed reverse DNS.  See:
> >>
> >>
> https://secure.wikimedia.org/wikipedia/en/wiki/Forward-confirmed_reverse_DNS
> >>
> >> For example, your trusty cialug.org server sits on 67.224.64.36, which
> >> resolves to mail.cialug.org, which in turn resolves to 67.224.64.36.  A
> >> perfect match.  The great majority of spamcannons lack matching DNS
> >> records, and virtually all legitimate mailservers have them.  And any
> >> legit server should be able to get them, if they don't already.
> >>
> >> How to verify if your mail server has matching DNS records:
> >>
> >> 1. Find its (public, if necessary) IP address.
> >> 2. Resolve it via the command dig -x <ip>, ie,
> >>
> >>  dig -x 67.224.64.36
> >>
> >> 3. Resolve the hostname you got from step #2, if applicable, via
> >> dig <hostname>, ie,
> >>
> >>  dig mail.cialug.org
> >>
> >> If the records match, you're good to go.
> >>
> >> However if you get NXDOMAIN for either query, or if the records don't
> >> match, you'll need to talk to your ISP.  Explain that you need
> >> Forward-confirmed reverse DNS to talk to cialug.org, as described in
> RFC
> >> 1912, specifically section 2.1:
> >>
> >> "Every Internet-reachable host should have a name.  The consequences
> >>  of this are becoming more and more obvious.  Many services available
> >>  on the Internet will not talk to you if you aren't correctly
> >>  registered in the DNS.  Make sure your PTR and A records match.  For
> >>  every IP address, there should be a matching PTR record in the
> >>  in-addr.arpa domain."
> >>
> >> If you don't know if this applies to you, send me a private mail with
> >> your mail server's IP address and I'd be happy to check for you.
> >>
> >>
> >> SECOND, Postfix is now using sbl-xbl.spamhaus.org and is blocking
> >> significant amounts of spam.  (Including messages from the forged bryan@
> >> botnet of recent fame.)  We don't see this spam on the list but the list
> >> admins get copies of it in our mailboxes and have to wade through it
> >> while maintaining mailman.  Currently it's 50 - 100 spam messages a day,
> >> every day, and would presumably grow much larger as spam levels return
> >> to normal after post-Rustock botnet spam levels normalize.
> >>
> >> Third, I would prefer to simply discard all non-subscriber posts.  Does
> >> anyone actually post from a non-subscriber address?
> >>
> >> Nicolai
> >> _______________________________________________
> >> Cialug mailing list
> >> Cialug at cialug.org
> >> http://cialug.org/mailman/listinfo/cialug
> > _______________________________________________
> > Cialug mailing list
> > Cialug at cialug.org
> > http://cialug.org/mailman/listinfo/cialug
> _______________________________________________
> Cialug mailing list
> Cialug at cialug.org
> http://cialug.org/mailman/listinfo/cialug
>

-- 
Matthew Nuzum
newz2000 on freenode, skype, linkedin and twitter

"My aim has always been to get to the truth rather than to support some
position. And in criticizing others, I have always tried to understand what
their
position was and not to misrepresent it. I have never been interested in
cheap
victories." -Ronald Coase
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