iknl.nl

Checked 22 October 2026, 13:52 UTC · via 8.8.8.8
!Passed with warnings
30 passed 2 warnings 0 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 ip4:77.222.73.230/32 ip4:141.138.168.199/32 ip4:185.46.182.1/32 ip4:185.46.182.200/29 ip4:185.46.182.208/31 ip4:185.52.104.5/32 ip4:185.52.106.5/32 ip4:141.138.168.119/32 include:_spf.mail.services.bastion365.net include:spf.flowmailer.net include:spf.protection.outlook.com ~all
DNS lookups
3 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 3 of 10 DNS lookups #2
    SPF record needs 3 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.iknl.nl)

Found

Record
v=DMARC1; p=reject; rua=mailto:dmarc@inbound.flowmailer.net; ruf=mailto:dmarc@inbound.flowmailer.net; fo=1
Found at
_dmarc.iknl.nl
External report address
mailto:dmarc@inbound.flowmailer.net (authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:dmarc@inbound.flowmailer.netAggregate report addresses
rufmailto:dmarc@inbound.flowmailer.netFailure report addresses
fo1Failure reporting options

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:dmarc@inbound.flowmailer.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: selector2, s1, s2

Found

Selectors
selector2, s1, s2
_domainkey
NOERROR
SelectorKeyFlags
selector2RSA 2048 bits
s1RSA 2048 bits
s2RSA 2048 bits

Checks

  • ✓ Keys found: selector2, s1, s2 #7
    DKIM keys found for this domain with selectors: selector2, s1, s2
  • ✓ Strong keys #23
    DKIM keys are strong enough: selector2: RSA 2048 bits; s1: RSA 2048 bits; s2: 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
3833, 11860
Signatures valid until
16 December 2026, 18:00 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 2026-12-16 #21
    DNSKEY signatures are valid until 2026-12-16T18:00:19Z.

MX

warn

1 mail server

Found

PriorityHostRecordsReverse DNS
0iknl-nl.p-v1.mx.microsoftA 52.101.103.137 A 52.101.103.36 A 52.101.103.39 A 52.101.103.162 AAAA 2a01:111:f403:ca09::24 AAAA 2a01:111:f403:c967::c AAAA 2a01:111:f403:ca09::26 AAAA 2a01:111:f403:c967::8mail-miypr02cu00101.inbound.protection.outlook.com ✓ mail-miypr05cu00104.inbound.protection.outlook.com ✓ mail-miypr05cu00207.inbound.protection.outlook.com ✓ mail-miypr03cu00202.inbound.protection.outlook.com ✓ mail-am6pr02cu00204.inbound.protection.outlook.com ✓ mail-cpjpr05cu00204.inbound.protection.outlook.com ✓ mail-am8pr83cu00106.inbound.protection.outlook.com ✓ mail-cpjpr04cu00100.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

no MTA-STS · TLS-RPT · DANE on 1 of 1 MX hosts

Found

TLS-RPT record
v=TLSRPTv1; rua=mailto:tlsrpt@iknl.nl

DANE (TLSA records)

MX hostTLSADNSSEC
iknl-nl.p-v1.mx.microsoft3 1 1 cfd68bde4129c00a… 3 1 1 803f7447cc75b208… 2 0 1 c1ad7778796d20bc… 2 0 1 ea7a25255d111fc3… 3 1 1 54883cc5f1849331…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:tlsrpt@iknl.nl
  • ✓ DANE on all MX hosts #36
    All 1 MX host 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