Free email security report

Here's how 01mh.de protects its email

Checked August 01, 2026 22:04

60 Medium

Core protections

SPF

Protected

A strict SPF policy is in place — servers not on the approved list are rejected outright.

Show raw DNS record 
v=spf1 -all

DKIM

Not configured

No DKIM signing key was found under any common selector. Recipients have no way to verify a message wasn't altered in transit.

Show raw DNS record 
No record found.

DMARC

Protected

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

  • No aggregate reporting is configured — the domain owner has no visibility into who's sending on their behalf.
Show raw DNS record 
v=DMARC1; p=reject

Advanced protections

MTA-STS Not found TLS-RPT Not found DNSSEC Not found BIMI Not found CAA Not checked yet

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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.