Check any domain's SPF, DKIM, DMARC, BIMI, MTA-STS and DNSSEC setup in seconds — the same auth-risk engine CompetitorInbox uses to track competitor ESPs and sending health. 10 free checks per hour, no signup.
CompetitorInbox tracks competitor ESP migrations, DNS auth changes, and send cadence automatically — so you see a deliverability drop or ESP switch the week it happens, not months later.
See CompetitorInbox →