tu-ilmenau.de

p=quarantine (_dmarc.tu-ilmenau.de)

Found

Record

v=DMARC1; p=quarantine; sp=quarantine; np=reject; pct=1; rua=mailto:dmarc2024@tu-ilmenau.de; ruf=mailto:dmarc2024@tu-ilmenau.de; fo=1

Found at

_dmarc.tu-ilmenau.de

Checks

• !

  Policy: quarantine

  DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.

  #4
• ✓ Record published #5

  DMARC record exists for this domain.
• ✓ Valid syntax #17

  DMARC record syntax is valid.
• !

  Applies to 1% of mail

  DMARC policy only applies to 1% of failing mail (pct=1). Raise pct to 100 once you are confident in your setup.

  #18
• ✓ Aggregate reports enabled #19

  Aggregate reports are sent to: mailto:dmarc2024@tu-ilmenau.de
• ✓ Subdomain policy: quarantine #20

  Subdomains are covered by policy 'quarantine'.
• ✓ Report addresses in own domain #29

  All report addresses are in your own organizational domain.

No keys found under the checked selectors

Found

Selectors

None found

_domainkey

NOERROR

Checks

• !

  No key under common selectors

  The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.

  #7

Not signed

Found

DNSKEY records

No (0)

DS at parent

No

Checks

• !

  Not enabled

  DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.

  #8

6 mail servers

Found

Checks

• ✓ 6 MX records #9

  Found 6 MX records for this domain.
• ✓ All hosts resolve #10

  All MX records resolve to valid IP addresses.
• !

  Hosts without IPv6

  The following MX hosts could not be resolved to IPv6 addresses: a2221.mx.srv.dfn.de, b2221.mx.srv.dfn.de, c2221.mx.srv.dfn.de, mail-router1.rz.tu-ilmenau.de, mail-router2.rz.tu-ilmenau.de, mail.tu-ilmenau.de

  #11
• ✓ Redundant MX hosts #12

  Found 6 MX records, which provides redundancy for email delivery.
• !

  More than 5 MX records

  Found 6 MX records, which is more than the recommended maximum of 5. Too many MX records may indicate a misconfiguration.

  #13
• ✓ No localhost targets #14

  No MX records pointing to localhost found.
• ✓ No private IP addresses #15

  No MX records resolving to private IP addresses found.
• ✓ No CNAME targets #22

  No MX records point to a CNAME.
• ✓ Reverse DNS confirmed #30

  All 7 MX addresss have a PTR record that resolves back to them.

no MTA-STS · no TLS-RPT · DANE on 3 of 6 MX hosts

Found

DANE (TLSA records)

Checks

• !

  Not configured

  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

  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
• !

  Not all MX hosts use DANE

  These MX hosts publish no TLSA records, so mail to them is not protected by DANE: mail-router1.rz.tu-ilmenau.de, mail-router2.rz.tu-ilmenau.de, mail.tu-ilmenau.de.

  #36