Hi Dan,
It seems to be an old problem,
I tried to make an example on the sendmail dialog, as a spammer,
I can open a connection to your server on port 25:
- issue the mail command and
- fill in the data as if I were sending an email from "your email" to
"yourself",
- and the email is happily accepted by sendmail.
Try it,
The semi-solution (I would call it an aspirin) is to remove your own
addresses and domain names from the whitelist,
in which case will trap incoming spam,
but the email would have been received anyhow
--and cpu resources are used to process the spam and finally delete it.--
DNS BL are not very useful in my case I actually used them to no avail, I
tried to block ISPs Ip adresses blocks from the offending spammers however
their IP/server database seemed to be unlimited (3 weeks of daily blocking
new ip ranges and domains-- "maybe try harder is the suggestion for now" ),
and spam from different regions of the world, from valid companies and valid
hosting providers kept coming in.
Every day a different country and different ISP, Korea, Poland, Turkey,
Brasil, Italy.
So its spamassassin's call now, (the cost on our cpu cycles for now.)
Hope that clears it out.
Rodrigo O
Xnet
-----Original Message-----
From: Dan Kriwitsky [mailto:webhosting (at mark) yahoo.com]
Sent: Lunes, 16 de Febrero de 2009 09:25
To: coba-e (at mark) bluequartz.org
Subject: [coba-e:15084] Re: Spam Problem
--- On Mon, 2/16/09, Rodrigo Ordonez Licona <rodrigo (at mark) xnet.com.mx> wrote:
> Emails are getting through even though we have disabled
> popauthenticated service.
>
> We have a Bluequartz Fully yummed (with Nuonce avspam), If you send an
> email from a valid address to that valid address the message is
> accepted.
>
Are you using any DNSBL? I don't see what the problem is? I gather you're
receiving spam. Look up the sending IP here
http://www.dnsbl.info/dnsbl-database-check.php
You may want to configure a few DNSBL in sendmail.
--
Dan Kriwitsky