I’ve noticed several times in the last week a server of mine that is using postfix has rejected messages due to a failure in the lookup at relays.ordb.org. At first, I thought this was just a false positive in the database at ordb… but this morning I finally “caught it” while it was happening and went to pull up the ordb.org web page. It took…. 30-45 seconds and then proceeding to do a search on the rejected IP took another stretch. In looking at the logs it appears that there may be blanket rejections if the ordb.org check times out.
Here’s the postfix config setting….
smtpd_client_restrictions = permit_mynetworks,reject_rbl_client relays.ordb.org
I’ve tried to look for information, the ordb.org web page doesn’t have any news more current than 2004-05-01…
I’ve got to say the behaviour looks as though they’re just under heavy traffic, but in recent days I’ve seen several cases where the ordb.org check bounced every message for an hour or so (I’m assuming due to connectivity issues.)
Are they under attack? Overloaded?
Is there any way postfix might check the accessibility of a rbl before it tries to make use of it. (i.e. if ordb.org is unreachable skip that test.)
Unfortunately it looks like I’ll have to disable it for a time (and let in the ~400 more junk messages a day….)
As of today there is an announcement on the ordb.org site that the Open Relay Database is shutting down. Message here – it does say to expect the site to shut down by the end of this year… so, here is the text….
ORDB.org is shutting down
We regret to inform you that ORDB.org, at the ripe age of five and a
half, is shutting down. It’s been a case of a long goodbye as very
little work has gone into maintaining ORDB for a while. Our volunteer
staff has been pre-occupied with other aspects of their lives. In
addition, the general consensus within the team is that open relay RBLs
are no longer the most effective way of preventing spam from entering
your network as spammers have changed tactics in recent years, as have
the anti-spam community.
We encourage system owners to remove ORDB checks from their mailers
immediately and start investigating alternative methods of spam
filtering. We recommend a combination involving greylisting and
content-based analysis (such as the dspam project, bmf or Spam Assassin).
DNS and the mailing lists will vanish today, December 18, 2006.
This website will vanish by December 31, 2006.
Related PostsRelated Posts
- Scheduling tasks in linux cron Windows has scheduled tasks which most people are only halfway aware of. Linux has very powerful scheduling capabilities coming from it's unix heritage. cron is the daemon that deals with scheduled tasks under most linux distributions. There are a couple ways that you can schedule cron tasks. The first is......
- More postfix spam blocking.... Postfix has a NUMBER of tools for rejecting unwanted messages before they get in the door and waste your CPU time on deciding "hey this mail is spam". Up until recently I've mostly used the relays.ordb.org check (which in the last couple months has now gone defunct.) When we started......
- The D-Link DWL-800AP+ as a wireless repeater to extend wireless range - Part 2 For starters, I hooked the D-link DWL-800AP+ up and connected it through a crossover cable to my usb network card. That way I could access it exclusively on one adapter and look online for information with the other adapter, which came in quite handy. The first thing I found was......
- What Will My Mortgage Cost a Month? Since the birth of our baby The Wife and I have been discussing future living arrangments lately.Â As often happens her parents (who live about 2.5 hours away) are visiting a lot more since there is someone there more important than The Wife and I (i.e. my cute child).Â ......
- Passive Income For October 2008: A New Record! I've been busy with Business School and it's been an insanely hectic month. Forget about writing posts, I haven't even had much time to sleep! I just ran the totals for passive income for October and I found out I've broken my previous record for monthly passive income that I......
- What Exactly Is SEO Hosting? SEO hosting has turned into a prevalent term in our day, and its attractiveness causes many people to ask 'what is SEO hosting?' People who regularly wonder about SEO hosting will find their answer with this article. What's SEO hosting? Why do we need it? Every single computer on the......
- Mail Server Rejecting all Messages – Check your Blacklists relays.ordb.org is listing the WORLD
- More postfix spam blocking….
- Sendmail mail queue backed up
- More postfix spam blocking and Whitelisting….
- Bellsouth/ AT&T mail problems