Free tools

Free email tools.

Everything you need to reach the inbox, grouped by the problem it solves: authenticate your domain, verify and clean your list, and diagnose deliverability. No account, no card; most run right in your browser.

Authenticate your domain

Prove your mail is really yours and pass the SPF, DKIM, and DMARC checks every mailbox provider now runs. Look up what's published, build the records, and read what the receivers report back.

Domain health checkSPF, DKIM, DMARC, MX, BIMI, and MTA-STS in one live report.Email auth checkerLook up a domain's SPF, DKIM, and DMARC records over live DNS.DMARC report analyzerTurn a DMARC aggregate (rua) report into a readable source breakdown.SPF record generatorAssemble a valid SPF TXT record from your sending sources.DMARC record generatorBuild a DMARC policy record, from p=none monitoring to enforcement.BIMI record generatorBuild a BIMI record to show your brand logo in supporting inboxes.MTA-STS & TLS-RPT generatorGenerate the records and policy to enforce TLS on inbound mail.MX record lookupSee a domain's mail servers and whether it can receive mail at all.Reverse DNS lookupCheck an IP's PTR record and whether it's forward-confirmed.

Verify & clean your list

Catch invalid, risky, and duplicate addresses before they bounce, trip spam traps, or drag down your sender reputation. These run right in your browser.

Free email checkerVerify a single address in your browser — status, reason, and score.Disposable email checkerSpot throwaway and burner inboxes before they hit your list.Email typo checkerCatch misspelled domains like gmial.com and hotnail.com.Email list de-duplicatorRemove duplicate addresses from a pasted list, right in your browser.

Diagnose deliverability

Troubleshoot why mail is landing in spam and measure the numbers that keep you in the inbox — trace a message, decode an error, and check your rates against the thresholds.

Blacklist checkerCheck an IP or domain against major DNS blocklists.Email header analyzerPaste raw headers to trace the Received hops, transit time, and auth results.SMTP code lookupDecode any 4xx or 5xx SMTP reply and enhanced status code.Bounce rate calculatorWork out your bounce rate and see whether it's in the healthy range.Complaint rate calculatorCheck your spam-complaint rate against the 0.1% target and 0.3% limit.Deliverability checklistScore your setup against the authentication, list, and reputation essentials.

Ready to verify a whole list?

The tools are the free front door; the full pipeline verifies and cleans an entire list over the API or a CSV — start free with 100 credits, no card required.

Start verifying