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dbfk.de

Checked 2026-10-21 22:12 UTC · first added 2026-10-21
!Passed with warnings Score 79 of 100

Domain & DNS

warn

26 passed 1 warn 0 failed

Areas

iRegistration iDelegation iNameservers ✓SOA !DNSSEC iRecords

Problems

  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 21 iterations and a 24-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Recent checks

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Mail

warn

22 passed 6 warn 0 failed

Areas

!SPF !DMARC !DKIM ✓DNSSEC !MX !TLS iBIMI

Problems

  • !
    10 of 10 DNS lookups, with problems
    SPF · SPF record needs 10 DNS lookups (limit is 10). Problems found: include:vpn-rz.dbfk.de does not exist or has no records.
    #2
  • !
    Policy: quarantine
    DMARC · DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.
    #4
  • !
    No key under common selectors
    DKIM · The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.
    #7
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: mx-01-eu-central-1.prod.hydra.sophos.com, mx-02-eu-central-1.prod.hydra.sophos.com
    #11
  • !
    1 void lookup
    SPF · 1 include/redirect target does not exist or has no records (limit is 2). This usually is a stale include; remove it.
    #26
  • !
    Not configured
    TLS · MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.
    #32

Recent checks

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