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DNS Blacklist Test Results for:
Agent Location
Monitoring Time
Duration (msec)
Error Description
Error Code
    • Amsterdan, Netherlands
    • 04/08/2015
    • Error Code: F
    • Duration: 1 ms
    • Status: 1
    • Error Description: 1
test32 2 05/03/2013 02:38:40 PM 51 S    
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DNS Blacklist (DNSBL) Test

Check to see if your hostname or IP addresses are listed on major anti-spam databases (blacklists). Being blacklisted can result in email delivery issues.

This tool performs an email blacklist check against a number of different blacklist services on the domain you specify. An email blacklist is sometimes also referred to as a DNSBL (DNS-based Blackhole List) as well as an RBL (Real-time Blackhole List). For automated blacklist testing, try .

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Email Blacklist Check

The blacklist test checks the following authoritative DNSBLs:


If the specified domain or IP address appears on a blacklist the test will return a failing result.

DNSBL Monitoring Test

Our free DNSBL test tool is great for running one-off checks when you think you might have a problem sending email. Administrators often do not know if their domain has been added to any of the major email blacklists. If you are an email Admin and concerned about the possibility of being blacklisted, try the Dotcom-Monitor ongoing blacklist monitoring service - free for 30-days. Dotcom-Monitor's DNSBL service sends a proactive email, SMS text message or phone call notifications as soon as your domain or IP addresses is detected on a blacklist.

Resolving DNS Blacklist Issues

Because email blacklists are used by many email providers to automatically filter out messages originating from blacklisted addresses, you could be unknowingly blacklisted for months. This means that any communications you send to customers or business partners may never be received. This may leave you wondering "is my email address blacklisted?"

How to Remove Your IP from an Email Blacklist

To remove your addresses from email blacklists you will need to identify which sites you are black listed on and contact these sites individually. Each site may have individual methods and protocols for removing your email or IP from the blacklist. For example, some websites may have a form you'll need to complete in order to remove your address from a list. Keep in mind that before you complete an email blacklist removal form you need to be sure you have resolved the initial cause of the blacklisting.

If you can, run security scans on all devices behind your firewall to identify whether or not there is a rogue agent sending spam messages. This can be caused by someone inadvertently downloading and running malware on a personal machine. It may also be possible that a recipient of a legitimate email marked the email as spam. This type of blacklist is harder to detect, but it is also the reason most companies do not send out mass email campaigns from their own domains but instead use 3rd party mailing systems.

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