shell.nl

p=quarantine (_dmarc.shell.nl)

Found

Record

v=DMARC1;p=quarantine;sp=reject;fo=1;pct=100;ruf=mailto:SITI-Cyberdefence-DMARC-Analysis@shell.com;rua=mailto:SITI-Cyberdefence-DMARC-Analysis@shell.com

Found at

_dmarc.shell.nl

External report address

mailto:SITI-Cyberdefence-DMARC-Analysis@shell.com (not authorized)

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 100% of mail #18

  DMARC policy applies to all failing mail.
• ✓ Aggregate reports enabled #19

  Aggregate reports are sent to: mailto:SITI-Cyberdefence-DMARC-Analysis@shell.com
• ✓ Subdomain policy: reject #20

  Subdomains are covered by policy 'reject'.
• !

  Report address not authorized

  These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:SITI-Cyberdefence-DMARC-Analysis@shell.com (needs shell.nl._report._dmarc.shell.com). Ask the report provider to publish the record, or check the address.

  #29

Signed, DS published at parent

Found

DNSKEY records

Yes (5)

DS at parent

Yes

Algorithms

RSASHA256 (8)

Key tags

6991, 36811, 26737, 29391, 47559

Signatures valid until

25 October 2026, 06:48 UTC

Checks

• ✓ Signed, DS published at parent #8

  DNSSEC is enabled for this domain (DNSKEY and DS present), providing additional security for DNS lookups.
• !

  Signatures expire in 81h0m0s

  DNSKEY signatures expire at 2026-10-25T06:48:55Z (in 81h0m0s). Check that re-signing works.

  #21

1 mail server

Found

Checks

• ✓ 1 MX record #9

  Found 1 MX records for this domain.
• !

  Hosts without IP addresses

  The following MX hosts could not be resolved to IP addresses: mail.global.frontbridge.com

  #10
• !

  Hosts without IPv6

  The following MX hosts could not be resolved to IPv6 addresses: mail.global.frontbridge.com

  #11
• !

  Single MX host, no backup

  Only one MX record found. For better email reliability, consider adding at least one backup MX server.

  #12
• ✓ At most 5 MX records #13

  Found 1 MX records, which is within the recommended range (1-5).
• ✓ 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.

no MTA-STS · no TLS-RPT · DANE on 0 of 1 MX hosts (lookup failed for 1)

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
• i

  Not configured

  TLS-RPT lets senders report TLS delivery problems to you. It is most useful together with MTA-STS or DANE.

  #35
• i

  Could not be checked

  The TLSA lookup failed for: mail.global.frontbridge.com (DNS query for _25._tcp.mail.global.frontbridge.com failed: read udp 46.225.38.91:36193->8.8.8.8:53: i/o timeout).

  #36