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isbn.de

Checked 2026-10-21 23:00 UTC · first added 2026-10-21
✗Problems found Score 66 of 100

Domain & DNS

warn

23 passed 1 warn 0 failed

Areas

iRegistration iDelegation iNameservers ✓SOA !DNSSEC iRecords

Problems

  • !
    Not signed
    DNSSEC · The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Recent checks

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Full report

Domain & DNS report for isbn.de ›

Mail

fail

21 passed 7 warn 1 failed

Areas

✓SPF !DMARC !DKIM !DNSSEC !MX !TLS ✗BIMI

Problems

  • ✗
    DMARC not strict enough for BIMI
    BIMI · Mail clients will not show the logo. BIMI requires DMARC pct=100.
    #39
  • !
    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
  • !
    Not enabled
    DNSSEC · DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.
    #8
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: mail.mwmx.de
    #11
  • !
    Single MX host, no backup
    MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • !
    Applies to 90% of mail
    DMARC · DMARC policy only applies to 90% of failing mail (pct=90). Raise pct to 100 once you are confident in your setup.
    #18
  • !
    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
  • !
    No certificate (a=)
    BIMI · The logo is published without a Verified Mark Certificate. Gmail and Apple Mail only show BIMI logos with a VMC or CMC; Yahoo shows it without one.
    #38

Recent checks

✗

Full report

Mail report for isbn.de ›