knowledge management

[Bill Campbell]

On Mon, Oct 16, 2006, Roger Oberholtzer wrote:
>On Sun, 2006-10-15 at 22:45 -0600, Collins Richey wrote:
>> On 10/13/06, Roger Oberholtzer <roger at opq.se> wrote:
>> > On Mon, 2006-10-09 at 14:48 -0700, Bill Campbell wrote:
>> >
>> > Bill, I have tried to respond to a question you asked off list. But your
>> > mailer does not like mail from my domain (opq.se). I think the reverse
>> > lookup should be working. If not, I can investigate. I do not control
>> > the process. Or is it something else. I get this:
>> >
>> >
>> 
>> You're not in a very exclusive group, Roger. I can't send mail to him
>> either. Bill's mail system practices guilt by association. In my case
>> it's because my mail is sent by Comcast.

We don't reject on Comcast per se, but there are probably Comcast addresses
listed on one or more DNSRBLs that list dynamic IP addresses.  For our
customers who're on Comcast, QWest dynamic or single static IP addresses,
or similar systems that may have problems or restrictions sending directly,
we set them up to send all outgoing mail through one of our servers on a
port other than 25 to bypass the restrictions.  We also have several using
uucp over TCP for all incoming and outgoing e-mail, and have never found a
broadband provider blocking uucp.

>Mine is in my own system. I am connecting direct. No other servers in
>between. Bill, can you verify that it is the reverse lookup that is
>failing? Otherwise, your blacklist is in error.

Our system is picky about accepting mail from servers, requiring properly
configured DNS.  There must be working reverse DNS (rDNS) and the forward
DNS for the hostname returned by rDNS must be the same as the IP
connecting.

Looking through the headers of this message, the IP 62.209.160.46 has no
rDNS.

On the other hand, our servers accept *ALL* mail to our postmaster,
security, and abuse addresses before doing any other checks, and mail to
these addresses has no spam checking.  This allows me to look at the
headers to see why messages are being refused, and add the IP addresses to
our white list if necessary.

...
Bill
--
INTERNET:   bill at Celestial.COM  Bill Campbell; Celestial Software, LLC
URL: http://www.celestial.com/  PO Box 820; 6641 E. Mercer Way
FAX:            (206) 232-9186  Mercer Island, WA 98040-0820; (206) 236-1676

``I presume you all know who I am.  I am humble Abraham Lincoln.  I have been
solicited by many friends to become a candidate for the legistlature.  My
politics are short and sweet, like the old woman's dance.  I am in favor of
a national bank ... in favor of the internal improvements system, and a
high protective tariff.'' -- Abraham Lincoln, 1832