Security & SEO

    Blacklist & reputation check

    Checks your domain and mail-sending IPs against Spamhaus, Barracuda, SORBS, and 15 other RBLs — alerts within minutes of a listing.

    Updated 2026-07-10
    1 min read
    blacklist
    rbl
    reputation

    Quick answer#

    Lemwatch queries 18 major DNSBLs for your MX IPs and apex A records every 6 hours. Any listing raises a severity: high incident with the RBL name and delisting URL.

    What it checks#

  1. Spamhaus SBL/XBL/PBL
  2. Barracuda, SORBS, UCEPROTECT L1-3
  3. SURBL, URIBL for URL-based lists
  4. Historical listings (last 30 days) shown in a timeline

    5. Where to find it in Lemwatch#

    Site details → Security → Reputation.

    How to respond#

  5. Click through to the RBL's delisting form.
  6. Fix the root cause (compromised mailbox, forwarder loop, malware) before requesting delisting.
  7. Wait 24-72 hours for delisting to propagate.
  8. Acknowledge once cleared.

    9. FAQ#

    Why 18 lists and not 100?#

    Most obscure RBLs have poor accuracy — we curate to reduce false positives.

    Can I add my own RBL?#

    Agency+ plans support custom RBL hosts.

    Related#

  9. DMARC record check
  10. Malware detection
  11. Why did my SSL grade drop
    12. Was this article helpful?

    Previous

    DMARC record check

    Next

    Open port scan check

    Related Articles

    DMARC record check

    Explains how to read a DMARC record, assess SPF and DKIM alignment, and make a staged policy decision without treating a DNS record as proof of mail delivery.

    Malware & Threat Detection

    Scan your sites for malware, phishing indicators, and blocklist status.

    Why did my SSL grade drop?

    SSL grade drops when a cipher, protocol, or certificate chain changes — here is how to identify the exact cause and fix it.

    Structured data (JSON-LD) check

    Validates schema.org JSON-LD on every crawled page against Google's rich-results eligibility rules.

    Back to Help Center