Bitelio
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Email blacklist &
IP reputation checker

Enter an IP address or domain and we check it against dozens of DNS blacklists at once — so you know instantly whether your mail is being blocked before it reaches the inbox.

Blacklist lookup

Enter a sending IP address or a domain. Domains are resolved to their IP before checking.

§ 01Blacklists explained

Blacklists, the short version.

DNSBLs are the reputation lists mailbox providers consult before deciding where your mail lands.

What a DNSBL is

A DNS-based blocklist (DNSBL) is a published list of IPs and domains known for sending spam. Receiving servers query these lists in real time to decide whether to accept, filter, or reject your mail.

Spamhaus & the big lists

Lists like Spamhaus (SBL, XBL, PBL), Barracuda, and SpamCop are consulted by a huge share of mailbox providers. A listing on even one of them can quietly tank your inbox placement.

Why you get listed

Spam traps, high complaint rates, sending from a compromised server, or sharing an IP with a bad neighbour all trigger listings. It usually reflects a real deliverability problem worth fixing.

IP vs domain reputation

Some lists track sending IPs, others track domains and URLs found in message bodies. We check both surfaces so you see the full picture of how receivers perceive you.

How to get delisted

Fix the underlying cause first — then use the blacklist operator's removal form. Delist before you clean up and you'll likely be relisted within days.

Prevention beats cleanup

Warming IPs gradually, authenticating with SPF/DKIM/DMARC, and pruning unengaged contacts keeps you off the lists in the first place. Reputation is far cheaper to protect than to repair.

Blacklisted or landing in spam?

Bitelio manages your sending IPs and reputation so you reach the inbox. Free to start — no credit card required.

Start with BitelioSender reputation guide

Frequently asked questions

What is an email blacklist (DNSBL)?

A DNSBL (DNS-based blocklist) is a public list of IP addresses and domains that have been flagged for sending spam or abusive mail. Mailbox providers query these lists in real time as mail arrives — if your sending IP or domain appears, your message can be rejected outright or filtered straight to the spam folder.

Why does being listed hurt my deliverability?

A large share of receiving servers consult blacklists such as Spamhaus, Barracuda, and SpamCop before accepting mail. A listing tells them your traffic is untrustworthy, so they may block the connection, throttle your sending, or route your messages to spam. Even one listing on a widely-used blacklist can cause a noticeable drop in inbox placement.

How did I end up on a blacklist?

Common causes include hitting spam traps, high spam-complaint rates, sudden sending spikes, a compromised or misconfigured server, weak authentication, or sharing an IP address with other senders who spam. A listing almost always points to a real underlying problem with your list hygiene or sending setup.

How do I get removed from a blacklist?

First fix the root cause — stop the spam source, clean your list, and lock down authentication (SPF, DKIM, DMARC). Then visit the delisting page of the specific blacklist operator (for example Spamhaus's removal center) and submit a request. If you delist before resolving the underlying issue, you will usually be relisted within days.

Should I check my IP or my domain?

Both. Some blacklists track the reputation of the IP address your mail is sent from, while others track the domains and links that appear in your messages. Enter an IP to check IP-based lists directly, or a domain and we will resolve it to its sending IP and check domain-based lists too.