A blacklist, also known as DNSBL or RBL (DNS Blacklist or Realtime Blacklist respectively) is a spam blocking list, that can prevent your mail server from sending email. If you find your mail server has been blacklisted, some email you send may never be delivered. Currently, there are more than 100 organizations that run these lists and each one has different specifications for adding your domain or ip to their list.

How does MxToolbox help?

We provide a free online blacklist check tool, where you can check if your domain or IP address is blacklisted. You can also learn how to get off and stay off blacklists with monitoring and setup a free blacklist monitor.

Not sure where to begin? We recommend starting with a Blacklist Check

Benefits to Blacklist Monitoring:

30 blacklists are checked automatically for free customers
Get alerted instantly if you land on a blacklist, as well as when you are removed
Upgrade: Over 100 blacklists checked multiple times every day and free blacklist removal support

Adaptive Blacklist Monitoring

Fix this listing. Then know the moment it happens again.

Adaptive Blacklist Monitoring uses your DMARC reports to find every service sending email as your domain, and alerts you when any of them lands on one of 100+ blacklists. No IP lists to maintain.

Mailchimp
HubSpot
Marketo
Salesforce
Google Workspace
Your own servers
+100 more

Email MarketersKnow when your ESP's sending IP gets listed, before a campaign stalls.
DMARC AdoptersTurn the DMARC reports you already collect into blacklist alerts for every sender.
IT Email AdministratorsGet alerts across every outbound source, including tools set up without IT.

Monitor All My Senders

Included in Delivery Center, $129/mo · 30-day money-back guarantee · Compare all plans