SurfaceMap › m › mytum.de

mytum.de

Checked 2026-10-21 23:31 UTC · first added 2026-10-21
✗Problems found Score 69 of 100

Domain & DNS

warn

27 passed 3 warn 0 failed

Areas

iRegistration ✓Delegation !Nameservers ✓SOA !DNSSEC ✓Records

Problems

  • !
    Software version disclosed
    Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: dns1.lrz.de: "9.20.29-1~deb13u1-Debian"; dns2.lrz.bayern: "9.20.29-1~deb13u1-Debian"; dns3.lrz.eu: "9.18.49-1~deb12u2-Debian"; ns.ze.tum.de: "9.17.1-dev-8422b23c921176329c07e57aa26dfa32ed63cd4f-8422b23c921176329c07e57aa26dfa32ed63cd4f". Hide or replace the version string.
    #17
  • !
    Signatures expire soon
    DNSSEC · The earliest signature expires at 2026-10-27 16:28 UTC (in 137h0m0s). Check that automatic re-signing works.
    #30
  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 5 iterations and a 8-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

!

Full report

Domain & DNS report for mytum.de ›

Mail

fail

22 passed 4 warn 1 failed

Areas

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

Problems

  • ✗
    Policy: none (monitoring only)
    DMARC · DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.
    #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
  • !
    Signatures expire in 137h0m0s
    DNSSEC · DNSKEY signatures expire at 2026-10-27T16:28:21Z (in 137h0m0s). Check that re-signing works.
    #21
  • !
    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
  • !
    Not configured
    TLS · MTA-STS or DANE is used without TLS-RPT, so you get no reports when senders fail to deliver because of TLS problems. Publish _smtp._tls TXT "v=TLSRPTv1; rua=mailto:...".
    #35

Recent checks

✗

Full report

Mail report for mytum.de ›