Email Warm-upEmail Blacklist Checker
Enter a domain or an IP address. For a domain, the checker resolves its A record and mail servers, then queries each IP against the DNS block lists receivers use, and the domain itself against URI block lists. A listing explains spam placement that warm-up alone will not fix, and each list has its own delisting process.
IP lists vs domain lists
IP block lists (SpamCop, Barracuda, SORBS) list the sending server. Domain lists (SURBL, Spamhaus DBL) list the domain in the From address or in links. Cold email senders on Google or Zoho mostly need to watch the domain lists.
Why does Spamhaus show as unavailable?
Spamhaus blocks queries from public DNS resolvers such as Google's, which this tool uses. Check spamhaus.org/lookup directly.
I am listed. Now what?
Stop sending from that domain or IP, fix the cause, wait 24 hours, then use the list's delisting form. Most lists clear automatically after a period without new spam reports.
Frequently asked questions
Does a blacklist listing explain my spam folder problem?
Sometimes. Most spam placement comes from reputation and authentication, not block lists. A listing is a definite problem; a clean result does not mean you are fine.
How often should I check?
Weekly during active campaigns, and immediately after a bounce storm or a drop in replies.
Which lists matter most?
Spamhaus (ZEN and DBL) and SURBL are consulted by most receivers. SpamCop and Barracuda are common in corporate mail gateways.
Can warm-up remove a listing?
No. Delisting is a separate process with the list operator. Warm-up rebuilds reputation afterwards.
Records right? Now build the reputation.
Connect the mailbox to the free warm-up service: it sends, replies and rescues from Spam on a shared warm-up network (or a private pool per account), and tells you when you are ready for outbound.
More free tools
A day-by-day sending plan for one mailbox: start volume, daily increase, cap, weekends. Copy it or download CSV.
SPF Record CheckerLooks up a domain's SPF record, counts DNS lookups against the limit of 10, and flags the mistakes that get mail rejected.
DKIM Record CheckerFinds a domain's DKIM public key by selector, tries the common selectors for Google, Zoho, Microsoft, SES, SendGrid and Mailgun, and validates the record.
DMARC Record CheckerReads the _dmarc record, explains the policy, alignment and reporting tags, and tells you the safe path from p=none to p=reject.