Free Tools
Free Email Deliverability Tools
Most deliverability headaches trace back to three culprits: broken DNS records, a blacklist hit, or headers that don't tell a consistent story. These tools let you work through all of it without signing up for anything.
Email Auth Checker
SPF, DKIM & DMARC lookup
Reputation going sideways? Start here. Enter a domain and it fetches live SPF, DKIM, DMARC and MX records - then shows you what's broken and how to fix it.
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Blacklist Checker
Check 16 RBLs in one go
Open rates dropped and you don't know why? A single Spamhaus listing can wreck deliverability for weeks. Enter your domain or IP and it checks 16 blacklists at once, with removal links for anything that hits.
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Header Analyser
Full email header breakdown
Email landing in junk and you've got no idea why. Grab the raw headers and paste them in. It maps out the whole journey - each relay hop, the auth check results, spam score, anything that looks off. Stays in your browser.
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MailVerify API
Need to verify email addresses too?
The MailVerify API checks each address in real time - valid, invalid, catch-all, disposable, role-based. ICO registered, data stays on GB servers. First 25 searches cost nothing.