bolt.ng

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

The basics are in place but can be hardened.

1Pass
1Warning
0Fail
4Not set

SPF

Pass

Authorizes which servers may send mail for the domain

SPF is published and within limits.

Policy: -all
DNS lookups: 0 / 10

Ends in -all (hardfail): unauthorized senders are rejected.
Uses 0 of 10 allowed DNS lookups.

v=spf1 -all

DKIM

Not set

Cryptographically signs outgoing mail (best-effort selector probe)

Only revoked DKIM keys (empty p=) are published.

A DKIM record with an empty p= value signals a revoked key, i.e. the domain publishes no active signing key (often a deliberate "sends no mail" marker).

DMARC

Warning

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

DMARC is published but not fully enforcing.

Policy: p=reject
Subdomains: sp=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; sp=reject; aspf=s; pct=100

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

Not set

Displays your verified brand logo in supporting inboxes

No BIMI record. No brand logo is published for inboxes.

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.