A blacklist check looks up whether your domain appears on the major email blocklists — Spamhaus, SURBL, and URIBL — that receivers consult before accepting mail. A single listing can send your email straight to spam or get it rejected. Enter a domain above to see its status on each list.

What is an email blacklist (DNSBL)?

An email blacklist, or DNSBL, is a published list of domains and IPs known for spam or abuse. Mailbox providers query these lists in real time during the SMTP conversation; if you are listed, your mail is throttled, sent to spam, or bounced outright.

Spamhaus, SURBL, and URIBL

Spamhaus is the most influential blocklist, covering both IPs and domains. SURBL and URIBL list domains found in spam message bodies, so a link to a listed domain can spam-filter an otherwise clean email. This tool checks all three.

FAQ

How do I check if my domain is blacklisted?

Enter the domain in the check above; it queries Spamhaus, SURBL, and URIBL live and shows the status on each. There is also a keyless API: GET https://api.tinysend.com/v1/tools/blacklist?domain=yourdomain.com — no signup.

My domain is on a blacklist — how do I get removed?

Fix the underlying cause first (a compromised account, an open relay, or a spammy send), then request delisting through each list’s removal form — Spamhaus and SURBL both provide one. Many listings expire automatically once the abuse stops.

Does being blacklisted affect deliverability?

Yes, heavily. A listing on a widely-used blocklist like Spamhaus can cause large mailbox providers to reject or spam-folder your mail until you are delisted.

Can an agent check blacklist status programmatically?

Yes. Call GET https://api.tinysend.com/v1/tools/blacklist?domain= with no key, or use the check_blacklist tool on the tinysend MCP server.