Free email infrastructure tools
No signup, no auth. Quick utilities for cold email infrastructure — DNS checks, record generators, and content spam scoring. Nothing you enter is stored.
DNS & Auth Record Checker
Look up the records cold email infrastructure depends on before you create inboxes, export accounts, or approve a launch gate.
SPF Record Generator
SPF tells receivers which mail servers are allowed to send for a domain. This generator helps avoid duplicate records and overly loose defaults.
DKIM Key & Record Generator
DKIM lets receivers verify that a message was signed by a key tied to your domain. This tool keeps key generation local in the browser.
DMARC Record Generator
DMARC tells receivers what to do when mail fails SPF and DKIM alignment. Start with monitoring, then tighten when legitimate senders are covered.
Email Spam Checker
This checker flags common wording, formatting, and compliance risks that should be reviewed before prospect traffic starts.
SPF Record Lookup
SPF breaks silently when a domain publishes duplicate records or nested includes push it past 10 DNS lookups. This lookup shows the record, its mechanisms, and the live lookup count.
DMARC Record Lookup
A DMARC record is easy to publish and easy to misread. This lookup fetches the record at `_dmarc` and decodes policy, percentage, alignment, and reporting so rollout stage is explicit.
DKIM Selector Checker
DKIM fails when mail is signed with one selector and the key is published under another. This checker probes the selectors common providers use, or tests the exact selector you expect.
Email Blacklist Checker
A listing on a major DNSBL can quietly stall a sending IP. This checker queries the widely used blocklists directly over DNS and reports each list's answer, including when a list could not be checked.
Cold Email Domain Checker
Brand-new domains and half-finished DNS are the two most common reasons cold email infrastructure stalls at readiness review. This checker reports registration age from public RDAP data alongside the auth-record baseline.
Inbox Readiness Checker
Before GTM Inboxes lets prospect traffic through a launch gate, DNS auth and content risk are among the inputs it checks. This tool runs the public versions of both so obvious blockers surface before setup work.
From one-off checks to readiness workflows
These tools are useful for checking one domain or one message. Managing dozens of client domains needs a repeatable workflow: capacity planning, DNS authentication, SMTP/IMAP smoke tests, seed-placement evidence, and readiness-gated exports.
Building automation? /api/public/dns-lookup returns the DNS checker results as JSON.