estudio.app

01Overview 02DNS 03WHOIS 04Subdomains 05Email 06TLS

Checking SPF, DKIM, and DMARC

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Tools

DNS Lookup
WHOIS Lookup
RDAP Lookup
Subdomain Finder
Email Security Check
SSL and TLS Certificate Checker

digga is open source under AGPL 3.0.

GitHub

Checking SPF, DKIM, and DMARC

Email authentication

Spoofing protection has gaps that need attention.

1Pass
2Warning
1Fail
2Not set

SPF

Warning

Authorizes which servers may send mail for the domain

SPF is published but could be tightened.

Policy: ?all
DNS lookups: 1 / 10

Ends in ?all (neutral): the policy effectively allows anyone.
Uses 1 of 10 allowed DNS lookups.

v=spf1 include:spf.mailjet.com ?all

DKIM

Pass

Cryptographically signs outgoing mail (best-effort selector probe)

DKIM key published for 3 known selectors.

Selectors: s1, s2, mailjet

Found a DKIM key at s1._domainkey.estudio.app
Found a DKIM key at s2._domainkey.estudio.app
Found a DKIM key at mailjet._domainkey.estudio.app

DMARC

Fail

Tells receivers what to do with mail that fails SPF and DKIM

No DMARC record. Failing mail is not actively rejected or quarantined.

No v=DMARC1 TXT record found at _dmarc.estudio.app
DMARC ties SPF and DKIM together and enables reporting.

MTA-STS

Not set

Enforces TLS for inbound mail and prevents downgrade attacks

No MTA-STS policy. Inbound mail can be delivered without TLS.

TLS-RPT

Not set

Receives reports about TLS delivery failures

No TLS-RPT record. You get no reports about failed TLS delivery.

BIMI

Warning

Displays your verified brand logo in supporting inboxes

BIMI is published with caveats.

Logo: https://estudio.app/logo.svg

A logo (l=) is published.
BIMI requires an enforcing DMARC policy (quarantine or reject) to be honored.

v=BIMI1; l=https://estudio.app/logo.svg

Checks query live DNS over Cloudflare and the public MTA-STS policy endpoint. DKIM selectors cannot be listed from DNS, so DKIM detection probes common provider selectors only.