Check if your domain is blacklisted
Check your domain and its mail server IPs against SpamCop, Barracuda, SURBL and other blocklists. See where you are listed and how to get removed.
How email blacklists workAn email blocklist (also called a blacklist or DNSBL) is a list of IP addresses or domains that sent spam or look unsafe. Many mail servers check these lists and refuse or filter mail from anything listed.
This checker looks up the domain itself on domain blocklists (SURBL and others), and the mail server and sending IP addresses it finds in DNS on IP blocklists: SpamCop, Barracuda, Mailspike, PSBL, UCEPROTECT Level 1, Blocklist.de and SpamRATS. If a list cannot be reached, the report says so and does not count it as clean.
How to read the result
- Clean: no list returned a listing for the domain or the addresses checked.
- Listed: the report names the list and the address. Each list has its own removal process; see the guides below.
- Not checked: some lists refuse queries from shared DNS resolvers. Spamhaus needs a data key, so it is shown as not checked when the key is not set.
- Which IPs: the check uses the addresses it can find from MX and SPF. If you send through a service with shared IPs, those are not your IPs, and a listing there is the provider's problem to fix.
Which lists matter most
Spamhaus is used by most large mailbox providers. Barracuda matters for companies that run Barracuda gateways. SpamCop listings expire on their own within about a day after the spam stops. UCEPROTECT Level 1 lists single IPs and has little effect at the big providers. Fix the cause first, then ask for removal; a list will add you again if the spam continues.
Common problems and fixes
Spamhaus removal
ZEN, SBL, XBL and PBL explained, and how to delist.
Barracuda removal
How to request removal from the Barracuda Reputation Block List.
SpamCop removal
Why it expires on its own and how to stop relisting.
Spamhaus DBL (domain) removal
When the domain itself is listed.
Microsoft 550 5.7.606
Your IP is on Microsoft's own block list.
Frequently asked questions
Why is my IP listed?
Usually because it sent spam, hit spam traps, has a compromised account or an open relay, or is a dynamic IP that should not send mail directly. The list's lookup page normally gives the reason.
How long does a blocklist removal take?
From minutes to a few days. SpamCop expires automatically. Spamhaus and Barracuda remove after you fix the cause and submit a request.
Does a blocklist listing affect Gmail?
Gmail uses mainly its own reputation data, not public lists, but a listing is a strong sign of a problem that also hurts Gmail placement. Check Google Postmaster Tools as well.
Can I be listed if I use Google Workspace or Microsoft 365?
Your own domain can be listed on domain lists. The sending IPs belong to Google or Microsoft, so IP listings there are rare and are theirs to fix.
How do I know when I get listed?
Run this check regularly, or add the domain to EmailHealth monitoring. It checks every day and sends one alert when a domain or sending IP lands on a list.