hersenstichting.nl

Checked 21 October 2026, 21:21 UTC · via 8.8.8.8
!Passed with warnings
30 passed 2 warnings 0 failed 3 info

SPF

info

SPF record published

Found

Record
v=spf1 redirect=_s091820iz.sdmarc.net
DNS lookups
9 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 9 of 10 DNS lookups #2
    SPF record needs 9 DNS lookups (limit is 10).
  • i
    Delegated via redirect
    SPF record has no 'all' mechanism but redirects to _s091820iz.sdmarc.net, whose policy applies.
    #3
  • ✓ 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.hersenstichting.nl)

Found

Record
v=DMARC1; p=reject; rua=mailto:a.091820iz@sdmarc.net; adkim=r; aspf=r
Found at
_dmarc.hersenstichting.nl
External report address
mailto:a.091820iz@sdmarc.net (authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:a.091820iz@sdmarc.netAggregate report addresses
adkimrDKIM alignment (r = relaxed, s = strict)
aspfrSPF alignment (r = relaxed, s = strict)

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:a.091820iz@sdmarc.net
  • ✓ 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

pass

Selectors: selector1, selector2

Found

Selectors
selector1, selector2
_domainkey
NOERROR
SelectorKeyFlags
selector1RSA 2048 bits
selector2RSA 2048 bits

Checks

  • ✓ Keys found: selector1, selector2 #7
    DKIM keys found for this domain with selectors: selector1, selector2
  • ✓ Strong keys #23
    DKIM keys are strong enough: selector1: RSA 2048 bits; selector2: RSA 2048 bits.
  • ✓ 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
ECDSAP256SHA256 (13)
Key tags
5504, 56480
Signatures valid until
29 October 2026, 00:00 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 2026-10-29 #21
    DNSKEY signatures are valid until 2026-10-29T00:00:00Z.

MX

warn

1 mail server

Found

PriorityHostRecordsReverse DNS
5hersenstichting-nl.mail.protection.outlook.comA 52.101.103.140 A 52.101.209.28 A 52.101.91.153 A 52.101.103.137 AAAA 2a01:111:f403:ca04::b AAAA 2a01:111:f403:ca09::28 AAAA 2a01:111:f403:ca48::8 AAAA 2a01:111:f403:ca38::amail-miypr02cu00204.inbound.protection.outlook.com ✓ mail-cpjpr05cu00104.inbound.protection.outlook.com ✓ mail-matpr04cu00101.inbound.protection.outlook.com ✓ mail-miypr02cu00101.inbound.protection.outlook.com ✓ mail-dbbpr03cu00103.inbound.protection.outlook.com ✓ mail-am6pr02cu00300.inbound.protection.outlook.com ✓ mail-miypr02cu00100.inbound.protection.outlook.com ✓ mail-wa4pr05cu00102.inbound.protection.outlook.com ✓

Checks

  • ✓ 1 MX record #9
    Found 1 MX records for this domain.
  • ✓ All hosts resolve #10
    All MX records resolve to valid IP addresses.
  • ✓ All hosts have IPv6 #11
    All MX records resolve to IPv6 addresses.
  • !
    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.
  • ✓ Reverse DNS confirmed #30
    All 8 MX addresss have a PTR record that resolves back to them.

TLS

warn

MTA-STS testing · TLS-RPT · DANE on 0 of 1 MX hosts

Found

MTA-STS record
v=STSv1; id=1722848838
Policy URL
https://mta-sts.hersenstichting.nl/.well-known/mta-sts.txt
Mode
testing
Allowed MX
hersenstichting-nl.mail.protection.outlook.com
Max age
604800 seconds
TLS-RPT record
v=TLSRPTv1; rua=mailto:reports@sendmarc.net

DANE (TLSA records)

MX hostTLSADNSSEC
hersenstichting-nl.mail.protection.outlook.comnone-

Checks

  • ✓ Record published #32
    MTA-STS record found with id 1722848838.
  • !
    Policy in testing mode
    With mode: testing, senders only report TLS problems (via TLS-RPT) and still deliver without TLS. Switch to mode: enforce once reports are clean.
    #33
  • ✓ All MX hosts covered #34
    Every MX host matches an mx: line of the MTA-STS policy.
  • ✓ Reports enabled #35
    TLS reports are sent to: mailto:reports@sendmarc.net
  • i
    Not used
    No MX host publishes TLSA records. DANE lets senders verify your mail server's certificate through DNSSEC; it requires DNSSEC on the MX host's zone.
    #36

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