How to create devices and tasks

DNSBL Blacklist task

A DNSBL task polls major domain name service (DNS) Blacklist (DNSBL) databases for an IP or a hostname you specify. If the IP or hostname is found in one of the DNSBL databases an error will be flagged and if you have alerts configured, an alert will be triggered.

The technology is built on top of the Internet Domain Name System. DNSBLs publish lists of addresses linked to spamming. Most mail transport agent (mail server) software can be configured to reject or flag messages which have been sent from a site listed on one or more of these DNSBLs.

If your mail servers are included in a DNSBL database it will cause other companies to deny email delivery from your servers. It is important to know if your servers are listed in DNSBLs, so you can quickly request removal and find the root cause of the DNSBL listing.

The DNSBL task references the following authoritative blacklists:

  • psbl.surriel.com
  • dnsbl.sorbs.net
  • bl.spamcop.net
  • zen.spamhaus.org
  • b.barracudacentral.org
  • all.spamrats.com

If your mail server or IP address are detected on any of these blacklists, you may need to contact the specified blacklist directly in order to determine why your address is listed and remove the address from the list

Creating a task

Once you have created a device and are adding or editing a DNSBL task, you will be prompted to adjust the following settings.

Hostname

Enter the server address to be monitored.  This could be the URL or the IP address.

Completion Timeout (in seconds)

Enter the number of seconds the task should wait for a response from the web page before aborting the task and returning an error. If this is left blank the default timeout for a task is 120 seconds.