When an IP address or domain is associated with suspicious activity, it may appear on a public blacklist. These lists are used by many anti-spam systems and can significantly affect email deliverability.
What is a DNSBL?
A DNSBL is a public list of IP addresses associated with spam, abuse or suspicious behavior. Mail servers may query these lists before accepting an email.
Business impact
- Emails rejected or sent to spam.
- Domain reputation degradation.
- Temporary blocking by providers.
- Loss of trust in outbound communications.
Why check regularly?
An IP can be blacklisted after a compromised account, poor SMTP configuration, an old unmanaged server or problematic hosting neighborhood.
How to react?
Identify the root cause, fix the configuration, verify SPF/DKIM/DMARC, then follow delisting procedures with the relevant blacklist providers.
Need to check your configuration?
Use Selection ICT diagnostic tools to get an initial view of your exposure.
Run a blacklist reputation check