SEO UTILITIES
Blacklist Lookup — Check DNSBL Spam Blacklists
Check whether an IP or domain appears on email spam blacklists (DNSBLs). Blacklisting can quietly cause your mail to bounce or land in spam folders.
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DNS-based blacklists (DNSBLs) are lists that flag IP addresses and domains known for sending spam. Mail servers worldwide consult them before accepting a message, so a listing can quietly cause your email to bounce or get filtered into junk — often the hidden reason outbound mail suddenly stops reaching inboxes.
How a listing happens — and how to get off
IPs get listed for sending spam (sometimes from a compromised account or malware), poor mailing practices, running an open relay, or simply inheriting a bad reputation from a shared or previously misused address.
Getting delisted is a two-step job: fix the underlying cause first — secure accounts, stop the spam source, correct your mail configuration — then use the specific blacklist's own removal process. Delisting won't stick if the problem that triggered it is still live. How much a listing hurts depends on how widely that particular list is used, so which lists flag you matters as much as whether you're flagged.
Frequently asked questions
- Should I check my IP or my domain?
- Both. Some blacklists track the sending IP, others track domains or sender reputation, so checking both gives a fuller picture of your email standing.
- Does one listing affect all my email?
- It depends on how widely that list is used. A major, popular blacklist can affect a lot of your mail; a niche one may have little impact.