Email Privacy Checker
Check if an email sender's server IP is on 10 major spam blocklists before outreach.
Checks 10 major email blocklists (DNSBLs) against the sender's mail server IP — no data stored.
How email blocklists work
DNS-based Blocklists (DNSBLs) are real-time databases maintained by security organisations and email providers. They track mail server IP addresses associated with spam, open relays, and malware distribution. When a mail server receives a connection, it queries these blocklists — if the sending IP appears on any list, the email is flagged or rejected.
What this tool checks
Paste any sender's email address above. The tool extracts the receiving mail server (MX record), resolves its IP address, then queries 10 major public blocklists simultaneously. Results appear in seconds with a clear verdict:
- Listed — the IP appears on this blocklist; emails from this sender are at risk of being flagged or rejected.
- Clean — the IP is not on this blocklist.
- Error — the check could not complete; retry or check manually.
Why this matters for SEO and outreach
If you are running cold email outreach for link building or PR, being listed on blocklists means your emails never reach the recipient — even if the content is perfectly legitimate. Tools like Mailchimp, Outreach.io, and Pitchbox all perform DNSBL checks before sending. Regular senders should monitor their sending IP reputation on services like MXToolbox and Sender Score.
Limits of this check
This tool resolves the MX (mail exchanger) of the sender's domain and checks the primary IP. Large email providers like Google and Microsoft use thousands of IP addresses, so one clean check does not guarantee the next email from the same domain will pass — and one listing does not mean all emails from that domain are spam (the specific sending IP matters). For thorough reputation monitoring, use MXToolbox's Blacklist Check or Cisco Talos Intelligence.