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......
- Evolution email error MAIL FROM command failed: Unknown Some time back, I was teetering on the brink.... I've used Evolution as my linux mail client for ages (since I switched), because it had the calender integrated etc... However, Kontact has REALLY looked nice for some time, but I didn't have time to mess with changing. Then one day,......
- Network Security - Arp spoofing So.... what is arp spoofing (poisoning).... and what are it's implications? ARP spoofing involves tricking a machine into thinking that you're machine is, yet another. Let's put this in IP address terms. Let's say that 192.168.0.1 is the default gatway on the network and 192.168.0.150 is our target. We are......
- Have you noticed that prices are rising? It seems as if the media willingly reminds us at least once a day that the economy is still a mess. Today, President Obama had to shuffle around some stimulus plans to offset the increasing unemployment numbers. Tomorrow? Well, who knows. Let's wait until then to worry about it. One......
- Links: Lending Club Interview Debtkid from Lending Club approached me about doing an interview for them. I'm generally very open to doing interviews for other sites and this was no exception. He came at me with some questions that required me to be more serious than I would normally be on Lazy Man and......
- Lance Armstrong h4>Sports-Memorabilia -> Sports-Collectibles -> Fan-Apparel-and-Souvenirs Lance Armstrong is one of today's most well-known names, both in professional cycling and professional sports in general. Born in 1971, he went on to win the Tour de France 7 years in a row from 1999 to 2005, a record-breaking run that guaranteed......
- 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