FREE TOOLS
Email & domain tools
A free toolkit for anyone running email on their own domains — check your setup, generate the records you need, and see what your mail is really costing you. Everything runs in your browser; nothing is stored.
Email authentication
SPF, DKIM & DMARC checkerCheck a domain's email authentication in one click.
DMARC record generatorBuild a correct DMARC policy with a simple wizard.
SPF generator & validatorCreate an SPF record and catch the 10-lookup limit.
DKIM key generatorGenerate a DKIM keypair locally in your browser.
DNS & mail servers
MX & email-host lookupSee a domain's mail servers and who runs its email.
All-in-one DNS lookupA, AAAA, MX, TXT, NS, CNAME, CAA — all at once.
DNS propagation checkerCompare answers across public resolvers worldwide.
Blocklist (DNSBL) checkerCheck a domain or IP against common blocklists.
Email utilities
Email header analyzerPaste headers to trace the path and auth results.
Email signature generatorBuild a clean HTML signature and copy it.
Password & passphrase generatorStrong secrets generated locally in your browser.
Favicon & app-icon generatorTurn any image into a full icon set.
QR code & UTM builderMake tracked links and QR codes in seconds.
Calculators & guides
Email cost calculatorSee what hosted email costs vs. owning it.
Gmail 2027 countdownTime left before "Send mail as" ends for custom domains.
Which email setup fits you?A short quiz with an honest recommendation.
Catch-all address generatorMake per-service addresses to catch leaks.
What can your provider read?See what a typical email provider can see.
Blue Folder Mail — your own encrypted mail for every domain, on your own Cloudflare account. See how it works →