Free Email IP & Domain Blacklist Checker (DNSBL)
Check if your sending IP or domain is listed on major anti-spam blacklists including Spamhaus (ZEN/SBL/XBL), Barracuda, SORBS, and SpamCop.
Why Cold Outbound Teams Use Our Free Blacklist Checker
Spamhaus ZEN, SBL, XBL, DBL check
Barracuda & SpamCop reputation lookup
Direct delisting guidance instructions
Email Deliverability Standards (US & UK Outbound Guidelines)
In February 2024, Google Workspace and Yahoo introduced strict anti-spam enforcement rules that mandate proper SPF, DKIM, and DMARC authentication for all outbound mailboxes. If your DNS records have syntax errors or exceed the 10-lookup threshold, incoming mail servers will silently route your cold outreach into the Spam folder or reject connections entirely.
Requires valid physical postal address in signatures, accurate From header identification, and clear opt-out mechanics.
Permits B2B outreach under legitimate interest when targeted to relevant corporate decision-makers with authenticated sender identity.
Frequently Asked Questions About Blacklist Checker
What should I do if my domain is on a blacklist?
Immediately pause active cold outreach campaigns. Visit the specific DNSBL lookup page (e.g. Spamhaus or Barracuda), submit a remediation delist request, and clean your prospect list of invalid/bounced emails.
Need Pre-Warmed Mailboxes Ready to Send?
Get fully authenticated, pre-warmed business inboxes on your own domains with dedicated US & UK IPs for just $4.00/mailbox/month.