We monitor 103 blacklists

Email blacklist monitoring service. IP and domain blacklist check runs as low as every 20 minutes.

How do you know if your mail server's IP is not blacklisted? Are you sure your domain name is not in a spam blacklist? How do you ensure email you are sending reaches your customers? Do you still believe that only spammers get blacklisted and since you never sent a single unsolicited email in your life you are immune?

Wake up!
You do not need to be a spammer to be awarded an inclusion into email blacklist. Your mail server may be misconfigured and actively exploited by bad guys. Software installed on your server may be exploited. Your workstation may be infected and forced to send spam without your knowledge. IP of your server may look like dial-up connection or share the same block of IP addresses with an outright spammer. And here goes the worst: no blacklist maintainer will notify you about your mail server IP inclusion into their spam database.

Blacklist check - test your IP address and domain name now.

Find your mail server IP address
IP, host name or domain name   
Check blacklist  IP blacklist check
Domain blacklist check
Debouncer provides the missing link. It checks IP and domain name of your mail server against comprehensive database of DNS based blacklists (DNSBL, or RBL). Debouncer promptly notifies you if your server was added to spam blacklist and provides a link to the page with blacklist removal instructions.
Do not wait for your customers to tell you about email problems: by the time the problem becomes patently obvious, it may be too late to remedy it. Get notified and act instantly the same day.

Your server blacklisted?

Do not know why is it on spam blacklist? Trouble with complying to AOL requirements? Consulting, troubleshooting and maintenance services available here. Ask for a free consultation now.

What is an email blacklist?

Email blacklists were originated as databases of IP addresses known (or believed) to be a source of email spam. Lately they evolved to include IPs of innocent servers that are either not secured enough (in the eyes of blacklist maintainers), or belong to wrong (again, in the eyes of blacklist maintainers) IP address block or even are close enough (hosted by the same internet service provider) to known spammer server - so called "collateral damage".

The blacklists are maintained by numerous companies, organizations and individuals. Various internet service providers consult these databases to block spam email. If mail server IP listed in one or more spam blacklists, email you send through that server may bounce with the following messages:

550-Rejected because is in a blacklist at dnsbl.sorbs.net
550 Blocked - see http://www.spamcop.net/bl.shtml? (in reply to RCPT TO command)

Also your emails may be silently dropped or flagged as spam and routed to recipient's spam folder. If it happens you do not even know that email was not received.

If you are an Internet Service Provider, Debouncer email blacklist inclusion alerts will allow early detection of customers abusing your mail server.

If you run your own mail server, Debouncer will help to ensure that email messages you are sending are successfully delivered.

Blacklist monitor features

  • Comprehensive and up-to-date list of live spam blacklists
  • Links to blacklist removal instructions
  • IP and domains checked as low as every 20 minutes
  • FCrDNS and dynamic IP test
  • Email alerts on blacklistings and delistings
  • API access
  • Hotmail/Outlook blacklist and SNDS spam trap hits monitoring
  • PhishTank phishing sites database monitoring
  • 1 year blacklist status history

Email server monitor features

  • TCP port monitor
  • Domain name resolution monitor
  • Reverse DNS resolution monitor
  • Email alerts on monitored state change
  • Monitoring from multiple locations