Email Reputation Check
Check major email blocklists + SPF, DKIM, DMARC + reverse DNS status.
Enter your input above and click "Check" to see results.
What is an Email Reputation Check?
An email reputation check combines blocklist (DNSBL) lookups with authentication checks: SPF, DKIM, DMARC, and reverse DNS. In one scan you see whether your domain or IP is listed on major blacklists, whether your records are configured correctly, and how receivers may treat your mail. Use this tool to fix issues before they hurt deliverability.
Blacklist Checker (DNSBL) Results
The tool queries a small set of major DNSBLs (e.g. SpamCop, CBL, Barracuda, Spamhaus). If your IP is listed, you’ll see which list and get links to request delisting. Results reflect public DNS; respect each list’s fair-use policy.
SPF, DKIM, DMARC & rDNS Validation
We check SPF (record and policy), DMARC (policy and enforcement), and optionally DKIM when you provide a selector. For IP checks we validate reverse DNS (PTR) and FCrDNS. Use the dedicated SPF Checker, DKIM Checker, DMARC Checker, and Reverse DNS Lookup for deeper analysis.
Common Issues & How to Fix Them
- Listed on a blocklist — Request delisting via the list’s site (links in the Blocklists tab). Fix the cause (e.g. compromised server, spam) first.
- Missing SPF or DMARC — Publish TXT records at your domain (SPF) and at
_dmarc.yourdomain.com(DMARC). Start with p=none for DMARC. - No PTR or FCrDNS mismatch — Set a PTR record for your sending IP that points to a hostname, and ensure that hostname resolves back to the IP (FCrDNS).
- DKIM “not checked” — Add a selector (e.g. default, mail) and re-run the check to validate your DKIM record.
Email Reputation Check FAQ
What is an email blacklist?
An email blacklist (DNSBL or RBL) is a list of IP addresses or domains that have been reported for sending spam or abuse. Receiving mail servers query these lists to decide whether to accept, quarantine, or reject messages. If your IP is listed, deliverability can drop. Use this tool to check major blocklists and get links to request delisting.
Why does reverse DNS matter?
Reverse DNS (PTR) and forward-confirmed reverse DNS (FCrDNS) help receivers verify that the sending server is authorized for the domain it claims. Missing PTR or FCrDNS mismatch can hurt reputation and trigger spam filters. Use our Reverse DNS Lookup for full PTR and FCrDNS validation.
Which policy is best for DMARC?
Start with p=none to collect reports, then move to p=quarantine and finally p=reject for strongest protection. p=reject tells receivers to reject messages that fail DMARC; use it only after you have verified that legitimate mail passes. Check your setup with the DMARC Checker.
Why does SPF have a 10-lookup limit?
RFC 7208 limits SPF evaluation to 10 DNS lookups (include:, a:, mx:, etc.) to prevent slow or abusive checks. Exceeding the limit can cause receivers to reject or softfail your mail. Use the SPF Checker to see your lookup count and flatten includes if needed.
How do I find my DKIM selector?
The DKIM selector is set in your mail server or provider (e.g. Google Admin, Microsoft 365, SendGrid). Common values are default, mail, google, selector1. Check your provider’s docs or DNS for a TXT record at selector._domainkey.yourdomain.com. Use the DKIM Checker to verify once you have the selector.