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Email Deliverability Check
Check MX, SPF (lookups counted through every include), DKIM, DMARC policy tags, the MTA-STS policy file, BIMI, DANE and blacklists, with a 0-100 score. Free.
Detected
Tool Features
Related Guides
Coming Soon Who sends mail as your domain: DMARC report intake in monitoring (Business plan) shows it daily.
Email Deliverability & Authentication Check
Email security audit: MX records, SPF with its DNS lookup count followed through every include and redirect, DMARC policy tags, the MTA-STS policy file, DKIM detection (18 common selectors), BIMI, MTA-STS, TLS-RPT and DANE/TLSA. Blacklist checks query 6 DNSBLs (SpamCop, PSBL, NordSpam, 0spam, UCEPROTECT level 1 and DroneBL — only lists whose operators allow commercial use) on up to 4 MX hosts; DroneBL lists infected hosts and open proxies rather than spam. Lists that charge for commercial use are not queried. Results include a 0-100 deliverability score with severity-rated diagnostics explaining why emails might land in spam.
How It Works
The tool queries MX records, then checks SPF, DMARC and DKIM by fetching the matching TXT/CNAME records. It also looks for BIMI, MTA-STS, TLS-RPT and DANE/TLSA. The IPs of up to 4 MX hosts are checked against 6 DNSBL blacklists, reading each answer code so that a refused query is not mistaken for a listing. The findings are combined into a 0-100 score.
FAQ
Why are my emails going to spam?
Common causes: a missing or wrong SPF record (sending servers not authorized), no DMARC policy (no instruction for receivers), no DKIM signing, or a mail server IP on a DNSBL blacklist. This tool checks that SPF, DMARC and a DKIM key are published, and whether the MX IPs are blacklisted. It cannot see whether the messages you send are actually signed — check the headers of a message you sent for that.
What is the difference between SPF, DKIM, and DMARC?
SPF specifies which servers may send email for your domain (IP-based). DKIM adds a cryptographic signature to each message proving it wasn't altered. DMARC ties SPF and DKIM together with a policy telling receivers what to do when checks fail (none/quarantine/reject).
What score should I aim for?
A score of 80+ indicates good email hygiene; below 60 points to issues that likely hurt deliverability. Four parts are worth 25 points each: MX records, SPF (−10 when it needs more than 10 DNS lookups), DMARC (−10 when the policy is p=none) and a DKIM key. Each blacklist listing takes off 15 points.