Gordano Knowledge Base
Article Q0524

Does the DNSBL try to access the DNSBLs directly or do they go through the DNS?

Question Background:
 GMS Anti-Spam has the option to check a number of DNS based Block Lists (DNSBLs) to check if any incoming connection is from a server that is known to be the source of spam. If such a source is identified, GMS Anti-Spam allows the administrator to decided what to do with the incoming request to send email.

Answer:
 GMS Anti-Spam queries the allocated RBL servers directly.

If you are operating GMS or GMS WebMail from behind a firewall, you will need to open up the UDP and TCP ports for DNS access (port 53).

A number of DNSBL type servers now work on a subscription basis, this can depend on the IP you are coming from. If you do this via DNS which may be running on a different IP then the lookup would be refused.

See Also:
Q0264   What is RBL?
Q0382   How do I set up GMS to use the RBL+ database from mail-abuse.org?

Bookmark this KB:
Feedback:
Did this article answer your question? Yes No
Applicable to version(s): 7+
Last updated: 25-Oct-2006
Key Words: DNSBL DNS security access
Email this article to:
 
To Print this article hold down the control key and press 'P' on your keyboard.
On a Mac, hold down the Apple key and press 'P'
 divclear
Log in to
Gordano Support
System
Customer Ref:
EMail:
Password:


- Forgot your password? click here for help.






  © Copyright 1994 - 2010 Gordano Limited Privacy