Article
Domain Blacklist Checker - CaptainDNS
captaindns.com
Quoted on this wiki
Every place a page here uses this source, in the order the words come in it.
Domain blocklists vs IP blacklists “A clean result here does not mean your sending IP is clean.” Type Target Detection Examples DNSBL (IP) Server IP address IP sending spam Spamhaus ZEN, Barracuda, SpamCop URIBL / SURBL (Domain) Domain in content Domain found in spam Spamhaus DBL, URIBL Black, SURBL Multi
Why check if your domain is blacklisted? “URI and RHS blocklists (URIBL, SURBL, Spamhaus DBL) flag the domains found inside message content, so a domain listing filters your mail even when the sending IP is perfectly clean and every record validates.” Impact of a blacklisted domain:
This tool checks the domain, not the IP. It queries URI and RHS blocklists (RHSBL and URIBL style), which flag domains found in the body of messages. A clean result here does not mean your sending IP is clean. To check the mail server IP, use the IP Blacklist Checker. “DNSBL (IP) Server IP address IP sending spam Spamhaus ZEN, Barracuda, SpamCop” Informational, non-blocking lists (such as PBL or UCEProtect L2 and L3) exist on the IP side; the domain lists checked here are all delivery-affecting, so a listing always matters.
The verdict and reputation score “The result leads with a 3-tier verdict, and the score supports it:” Clean: no weight-bearing active-spam list hit.
The result leads with a 3-tier verdict, and the score supports it: “Clean: no weight-bearing active-spam list hit.” At risk: only low-confidence signals, rare for domains and reserved for passive lists.
Clean: no weight-bearing active-spam list hit. “At risk: only low-confidence signals, rare for domains and reserved for passive lists.” Listed: found on at least one authoritative list (Spamhaus DBL, URIBL Black, SURBL Multi), deliverability is impacted now.
At risk: only low-confidence signals, rare for domains and reserved for passive lists. “Listed: found on at least one authoritative list (Spamhaus DBL, URIBL Black, SURBL Multi), deliverability is impacted now.” The verdict is backed by a 0 to 100 reputation score and a grade, weighted by each list's authority rather than a flat "listed on N of M" count:
Listed: found on at least one authoritative list (Spamhaus DBL, URIBL Black, SURBL Multi), deliverability is impacted now. “The verdict is backed by a 0 to 100 reputation score and a grade, weighted by each list's authority rather than a flat "listed on N of M" count:” Verdict Score Grade What it means Action Clean 95-100 A+ Clean on every list No action required Clean 85-94 A Minor signal only Monitor, delisting optional At risk 70-84 B Low-weight listing Review your sending practices Listed 50-69 C Authoritative listing Urgent action required Listed 30-49 D Multiple authoritative listings Priority delisting Listed 0-29 F Severely compromised reputation Security audit required
Three reasons to check regularly: “Detect if spammers are embedding your domain in spam or phishing” Identify a compromised website being used as a spam vector
Detect if spammers are embedding your domain in spam or phishing “Identify a compromised website being used as a spam vector” Verify a new domain before using it for email marketing
Type Target Detection Examples DNSBL (IP) Server IP address IP sending spam Spamhaus ZEN, Barracuda, SpamCop URIBL / SURBL (Domain) Domain in content Domain found in spam Spamhaus DBL, URIBL Black, SURBL Multi “Informational, non-blocking lists (such as PBL or UCEProtect L2 and L3) exist on the IP side; the domain lists checked here are all delivery-affecting, so a listing always matters.” How the domain blacklist check works
Q: How often should I check my domain's reputation? “For routine monitoring, a monthly check is good hygiene for email marketing domains.” Complementary tools
Q: How often should I check my domain's reputation? “After any security incident or major email campaign, and immediately if your emails start landing in spam.” Complementary tools