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Email Deliverability Test
Email deliverability diagnostics. Check MX, SPF, DMARC and DKIM settings and DNSBL listings for any domain.
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.