Loading ...Postfix and MS-Exchange Mail Server Affected by ORDB.org Spam Service
Since y'day I noticed one of our article related to ORDB.org spam blocker receiving lots of traffic. I received couple of calls from our clients because most emails was getting bounced via Exchange or Postfix mail server.
ORDB is now configured to return each IP as spam source
ORDB was a database of open relay email servers, provided until 2006 as a voluntary service to block spam. Now ORDB.org service has been re-activated and it is returning every IP address queried as being on its blacklist. I guess this was done to punish lazy sys admin / mail administrators 
If you or your mail server / gateway / firewall querying relays.ordb.org; please stop it immediately. If you query relays.ordb.org - mail server will rejecting all incoming mails from that server.
Symantec Mail Security for MS-Exchange Server - Spam Filter
Symantec Mail Security for Microsoft Exchange configuration in the list of Anti-spam blacklist servers including relays.ordb.org. Immediately remove the entry.
Remove ORDB.ORG from MS-Exchange Server Spam Filter
In Exchange Server 2003 you can find the feature for blacklist support within the global settings of your organization. Visit MS-Exchange System Manager > Global Settings > Message Delivery Properties -> Connection Filtering tab > Remove relays.ordb.org
Remove Linux / UNIX - Postfix Mail Server - Spam Filter
Open postfix configuration file and remove the following line:
reject_rbl_client relays.ordb.org,
Restart postfix mail server:
# service postfix restart
Want to stay up to date with the latest Linux tips, news and announcements? Subscribe to our free e-mail newsletter or full RSS feed to get all updates.
You can Email this page to a friend.
You may also be interested in...
- ORDB.org RBL Anti Spam service going offline
- Test mail server for an open relay
- Display remote applications on my local X server in Linux
- Howto prevent non-root users from login into the system using nologin shell
- Linux User does not exist - weird problem and solution
Discussion on This Article:
Leave a Reply
We encourage your comments, and suggestions. But please stay on topic, be polite, and avoid spam. Thank you very much for stopping by our site!
Tags: exchange system, global settings, incoming mails, mail administrators, mail security, mail server service, message delivery, microsoft exchange, ms exchange server, open relay, ordb, org mail, organization visit, postfix configuration, server gateway, servers, spam blocker, symantec, Sys admin, voluntary service ~ Last updated on: March 27, 2008
they should have waited for sysadmin day :p