Third party blacklist relays.ordb.org stops all mailflow when enabled

Products

• Mail Security for Domino
• Mail Security for Microsoft Exchange

Issue/Introduction

Mailflow has stopped since March 26th 2008.

Symptoms
Third party blacklists are enabled, and relays.ordb.org is present in the list. Any message sent to a domain protected by Symantec AntiSpam products gets a 550 5.2.1 or 554 response.

The messages look like:
 

"550 5.2.1 Mail from x.x.x.x refused: spam site."

 
Or,
 

"Your message did not reach some or all of the intended recipients.
 
Subject:     RE: test
Sent:        26/03/2008 10:56
 
The following recipient(s) cannot be reached:
 
[e-mail] on 26/03/2008 10:58

The message reached the recipient's e-mail system, but delivery was refused.  Attempt to resend the message.  If it still fails, contact your system administrator.

< mailserver.domain.ext #5.2.1 SMTP; 550 5.2.1 Mail from x.x.x.x refused: spam site.>"

Cause

This blacklist is no longer in use. It went out of service in December 2006.

Resolution

Remove relays.ordb.org from your list of 3rd party blacklists.



Technical Information
ORDB.org Going Offline: http://it.slashdot.org/article.pl?sid=06/12/18/154259&tid=230

Long-Dead ORDB Begins Returning False Positives: http://it.slashdot.org/article.pl?no_d2=1&sid=08/03/25/2124224