mthie.com

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

Checking SPF, DKIM, and DMARC

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digga is open source under AGPL 3.0.

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Checking SPF, DKIM, and DMARC

Email authentication

The basics are in place but can be hardened.

4Pass
1Warning
0Fail
1Not set

SPF

Pass

Authorizes which servers may send mail for the domain

SPF is published and within limits.

Policy: -all
DNS lookups: 1 / 10

Ends in -all (hardfail): unauthorized senders are rejected.
Uses 1 of 10 allowed DNS lookups.

v=spf1 mx -all

DKIM

Pass

Cryptographically signs outgoing mail (best-effort selector probe)

DKIM key published for 1 known selector.

Selectors: mail

Found a DKIM key at mail._domainkey.mthie.com

DMARC

Warning

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

DMARC is published but not fully enforcing.

Policy: p=reject
Coverage: 100%

Policy p=reject: failing mail is rejected outright.
No rua address: you receive no aggregate reports to monitor abuse.

v=DMARC1; p=reject; pct=100; adkim=s; aspf=s

MTA-STS

Pass

Enforces TLS for inbound mail and prevents downgrade attacks

MTA-STS is enforcing TLS.

Mode: enforce
Max age: 604800s

Policy mode is enforce: TLS is required for inbound mail.

v=STSv1;id=20260504140700;

TLS-RPT

Not set

Receives reports about TLS delivery failures

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

BIMI

Pass

Displays your verified brand logo in supporting inboxes

BIMI is published.

Logo: https://www.mthie.com/mthietv_logo.svg

A logo (l=) is published.

v=BIMI1; l=https://www.mthie.com/mthietv_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.