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csu.de

Checked 2026-10-21 22:11 UTC · first added 2026-10-21
✗Problems found Score 68 of 100

Domain & DNS

warn

26 passed 1 warn 0 failed

Areas

iRegistration iDelegation ✓Nameservers !SOA iDNSSEC iRecords

Problems

  • !
    Unusual SOA timers
    SOA · retry 1d should be shorter than refresh 1d. Current values: refresh 1d, retry 1d, expire 28d, negative TTL 10m.
    #23

Recent checks

!

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Domain & DNS report for csu.de ›

Mail

fail

10 passed 3 warn 2 failed

Areas

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

Problems

  • ✗
    No DMARC record
    DMARC · No DMARC record was found for this domain. DMARC is essential for preventing email spoofing. Add a DMARC record with p=reject or at least p=quarantine.
    #5
  • ✗
    No SPF record
    SPF · No SPF record was found for this domain. SPF is important for preventing email spoofing. Add an SPF record to specify which servers are authorized to send email for your domain.
    #6
  • !
    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: mx00.csu.de, mx01.mucix.net
    #11
  • !
    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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