delft.nl

Checked 21 October 2026, 21:00 UTC · via 8.8.8.8
!Passed with warnings
29 passed 3 warnings 0 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 include:spf.delft.nl.eu-zs8zcn3l.e1.dspf.app -all
DNS lookups
7 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 7 of 10 DNS lookups #2
    SPF record needs 7 DNS lookups (limit is 10).
  • ✓ Ends with -all #3
    SPF record properly uses -all to restrict unauthorized senders.
  • ✓ Record published #6
    SPF record exists for this domain.
  • ✓ Single record #16
    Exactly one SPF record is published.
  • ✓ Valid syntax #25
    All SPF mechanisms and modifiers are valid.
  • ✓ No void lookups #26
    All include/redirect targets exist.
  • ✓ No overly broad IP ranges #27
    All ip4/ip6 ranges are narrow enough.

DMARC

pass

p=reject (_dmarc.delft.nl)

Found

Record
v=DMARC1; p=reject; rua=mailto:zs8zcn3l@ag.eu.dmarcadvisor.com,mailto:rapportages@dmarc.ibdgemeenten.nl,mailto:zs8zcn3l@ag.eu.dmarcmanager.one; ruf=mailto:zs8zcn3l@fr.eu.dmarcadvisor.com
Found at
_dmarc.delft.nl
External report address
mailto:zs8zcn3l@ag.eu.dmarcadvisor.com (authorized)
External report address
mailto:rapportages@dmarc.ibdgemeenten.nl (authorized)
External report address
mailto:zs8zcn3l@ag.eu.dmarcmanager.one (authorized)
External report address
mailto:zs8zcn3l@fr.eu.dmarcadvisor.com (authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:zs8zcn3l@ag.eu.dmarcadvisor.com,mailto:rapportages@dmarc.ibdgemeenten.nl,mailto:zs8zcn3l@ag.eu.dmarcmanager.oneAggregate report addresses
rufmailto:zs8zcn3l@fr.eu.dmarcadvisor.comFailure report addresses

Checks

  • ✓ Policy: reject #4
    DMARC policy is set to 'reject', which provides the strongest protection against email spoofing.
  • ✓ 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:zs8zcn3l@ag.eu.dmarcadvisor.com, mailto:rapportages@dmarc.ibdgemeenten.nl, mailto:zs8zcn3l@ag.eu.dmarcmanager.one
  • ✓ Subdomain policy: reject #20
    Subdomains are covered by policy 'reject'.
  • ✓ External report addresses authorized #29
    Report addresses in other domains have published their authorization.

DKIM

warn

Selectors: k1, selector1, selector2

Found

Selectors
k1, selector1, selector2
_domainkey
NOERROR
SelectorKeyFlags
k1RSA 1024 bits
selector1RSA 2048 bits
selector2RSA 2048 bits

Checks

  • ✓ Keys found: k1, selector1, selector2 #7
    DKIM keys found for this domain with selectors: k1, selector1, selector2
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: k1 (1024 bits). Rotate to a 2048-bit key.
    #23
  • ✓ No problematic flags #24
    No keys in test mode, revoked, or limited to SHA-1.

DNSSEC

pass

Signed, DS published at parent

Found

DNSKEY records
Yes (2)
DS at parent
Yes
Algorithms
RSASHA256 (8)
Key tags
2304, 28456
Signatures valid until
21 November 2026, 01:01 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 valid until 2026-11-21 #21
    DNSKEY signatures are valid until 2026-11-21T01:01:31Z.

MX

warn

2 mail servers

Found

PriorityHostRecordsReverse DNS
10m1.delft.nlA 145.32.97.12m1.delft.nl ✓
10m2.delft.nlA 145.32.97.13m2.delft.nl ✓

Checks

  • ✓ 2 MX records #9
    Found 2 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: m1.delft.nl, m2.delft.nl
    #11
  • ✓ Redundant MX hosts #12
    Found 2 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 2 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.
  • ✓ Reverse DNS confirmed #30
    All 2 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · TLS-RPT · DANE on 2 of 2 MX hosts

Found

TLS-RPT record
v=TLSRPTv1; rua=mailto:zs8zcn3l@ag.eu.dmarcadvisor.com

DANE (TLSA records)

MX hostTLSADNSSEC
m1.delft.nl3 1 2 d798610db8a8dc67… 3 1 2 32c519c4f0892cb7…Yes
m2.delft.nl3 1 2 e7c49ed5c509e3f3… 3 1 2 fd046cdf8ff921cb…Yes

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
  • ✓ Reports enabled #35
    TLS reports are sent to: mailto:zs8zcn3l@ag.eu.dmarcadvisor.com
  • ✓ DANE on all MX hosts #36
    All 2 MX hosts publish DNSSEC-validated TLSA records.

BIMI

info

No BIMI record

Checks

  • i
    Not configured
    BIMI shows your logo next to your mail in supporting mail clients. It requires DMARC enforcement.
    #38