Free email security report

Here's how 3-klang.de protects its email

Checked August 02, 2026 04:38

Core protections

SPF

At risk

SPF is present but explicitly allows any server to send on this domain's behalf — this offers no real protection.

Show raw DNS record

v=spf1 +a +mx ?all

DKIM

Protected

A DKIM signing key was found — outgoing mail can be cryptographically verified as genuinely from this domain.

Show raw DNS record

dkim

DMARC

Protected

DMARC is set to reject — mail that fails SPF/DKIM alignment is blocked before it ever reaches an inbox.

Aggregate reports are configured, so the domain owner gets visibility into who's sending on their behalf.

Show raw DNS record

v=DMARC1; p=reject; rua=mailto:postmaster@netzdienste.net

Advanced protections

Protection	What it does	Status
MTA-STS	Forces incoming mail to travel over an encrypted, verified connection.	Not found
TLS-RPT	Reports failures in that encrypted connection, so problems don't go unnoticed.	Not found
DNSSEC	Cryptographically signs DNS records so they can't be spoofed in transit.	Present
BIMI	Shows a verified brand logo next to authenticated mail in the inbox.	Not found
CAA	Restricts which certificate authorities may issue TLS certificates for this domain.	Not found

Recommendation

What we'd fix first for 3-klang.de

SPF isn't set to reject unapproved servers outright, so spoofed mail can still get through.

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What do these mean?

What is SPF?

SPF (Sender Policy Framework) is a DNS record listing which mail servers are allowed to send email for a domain. Without it, anyone can forge the "From" address.

What is DKIM?

DKIM (DomainKeys Identified Mail) cryptographically signs outgoing email, letting the receiving server verify it wasn't altered in transit and really came from this domain.

What is DMARC?

DMARC tells receiving mail servers what to do with messages that fail SPF or DKIM checks — ignore them, quarantine them, or reject them outright.

What is MTA-STS?

MTA-STS forces incoming mail to this domain to travel over an encrypted, certificate-verified connection, closing off a common way attackers intercept mail in transit.

What is CAA?

A CAA record lists which Certificate Authorities are allowed to issue TLS certificates for a domain, making it harder for an attacker to get a fraudulent certificate issued elsewhere.