Question 1

What is an email blacklist?

Accepted Answer

An email blacklist (a DNSBL) is a public list of IP addresses and domains that mail providers consult before accepting email. If your mail server IP or domain appears on one, your messages, invoices, password resets, order confirmations, get rejected or dumped in spam by every provider using that list. The major lists, Spamhaus, SpamCop, Barracuda and others, are checked live by this tool straight from the lists themselves.

Question 2

Why would my domain or IP get blacklisted?

Accepted Answer

Usually one of four reasons: a compromised account or site sent spam from your server; you share an IP address with other senders on cheap hosting and a neighbour misbehaved; a sudden burst of bulk email looked like a spam run; or receiving servers reported your mail as spam often enough to trigger automated listing. On shared hosting the listing is frequently not your fault at all, which is why checking first, before blaming your email content, is the right order.

Question 3

What should I do if I am listed?

Accepted Answer

Read the listing reason this checker shows, then fix the cause before asking for removal: secure the account and change passwords if there was a compromise, move mail to your own sending service if a shared neighbour is the problem, and confirm your SPF, DKIM and DMARC records are correct. Then request delisting on the list operator's site, links are in their lookup results. Requesting removal without fixing the cause gets you relisted within days.

Question 4

What does a PBL listing on Spamhaus mean?

Accepted Answer

Less than it sounds. The PBL (Policy Block List) simply records IP ranges that the owning ISP says should not send mail directly, typically home and dynamic connections. If you send through a proper mail service or your host's SMTP server, a PBL entry for your home or office connection does not affect your email at all. This checker labels PBL results as policy listings so you do not panic over the one listing that is usually harmless.

Question 5

How often should I check?

Accepted Answer

Check whenever deliverability drops: open rates fall, customers say invoices landed in spam, or a mail tester flags you. Businesses that depend on email, shops, agencies, SaaS, should also check monthly as routine maintenance, and always after changing hosting, mail providers or sending domains, because a fresh IP can inherit someone else's bad history.

Email Blacklist Checker

Use Email Blacklist Checker

How to use the Email Blacklist Checker

Enter your domain or IP

Live DNSBL lookup

Read the per-list verdict

Fix and delist if needed

About the Email Blacklist Checker