[Cialug] Administrivia

[Matt]

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
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