Email-authentication toolkit

Diagnose the whole domain—or one record at a time.

Each tool queries live DNS and turns technical results into a clear next step. Nothing to install, no account to create.

Complete scan Domain Audit See your complete authentication posture, letter grade, and prioritized fixes. Deliverability SPF Checker Parse your record, trace every include, and catch the 10-lookup limit. Record builder SPF Generator Choose your senders and build a clean, conservative SPF record. Anti-spoofing DMARC Checker Inspect policy, alignment, reporting, and enforcement at a glance. Record builder DMARC Generator Create a staged DMARC policy with reporting that is safe to roll out. Message signing DKIM Checker Look up a selector and inspect the public key behind your signatures. Discovery DKIM Selector Finder Probe 50+ known provider selectors automatically—no guessing required. Mail routing MX Lookup Map mail exchangers and resolve their IPv4 and IPv6 addresses in parallel. Brand trust BIMI Checker Verify your logo, DMARC enforcement, and certificate configuration.