Here's how 100000km.de protects its email
Checked August 01, 2026 23:04
Core protections
SPF
PartialSPF is configured but only soft-fails unapproved servers, or its policy couldn't be read cleanly — spoofed mail may still get through.
Show raw DNS record
v=spf1 a mx ip4:37.17.224.0/21 ip4:185.30.32.0/22 ip4:88.82.224.0/19 ip4:45.153.56.0/22 ~all
DKIM
ProtectedA DKIM signing key was found — outgoing mail can be cryptographically verified as genuinely from this domain.
Show raw DNS record
dkim
DMARC
PartialDMARC is present but not set to reject, so mail that fails alignment may still be delivered or only flagged.
- 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=quarantine;
Advanced protections
Want this level of protection for your own attachments?
Adlerwacht adds passkey-verified, end-to-end secured delivery on top of whatever your domain already has configured.
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.