Question 1

What is an IP Blacklist / DNSBL?

Accepted Answer

An RBL/DNSBL blacklist is a real-time database maintained by cybersecurity entities that flags IP addresses and domains associated with spam, phishing, or malware distribution.

Question 2

Why did my IP get blacklisted?

Accepted Answer

IPs are blacklisted due to high spam volume, misconfigured open relay mail servers, malware infections on local devices, or missing SPF/DKIM/DMARC authentication.

Question 3

How does a blacklist affect my business?

Accepted Answer

If your mail server's IP address appears on an RBL, outgoing business emails sent to clients will be rejected or diverted straight to spam/junk folders.

Question 4

How do I request IP delisting?

Accepted Answer

First fix the root cause (e.g. resolve network malware, secure credentials). Then visit the specific blacklist provider's lookup portal (e.g., Spamhaus) to submit a delisting request.

Blacklist Check