sheerenloo.nl

Checked 22 October 2026, 15:50 UTC · via 8.8.8.8
!Passed with warnings
32 passed 2 warnings 0 failed 1 info

SPF

pass

SPF record published

Found

Record
v=spf1 ip4:51.138.13.149 include:_u.sheerenloo.nl._spf.dmarcla.com include:spf.protection.outlook.com include:spf.eprov.nl include:_spf.zivver.com -all
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).
  • ✓ 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.sheerenloo.nl)

Found

Record
v=DMARC1; p=reject; rua=mailto:60d1daacb2718@ag.dmarcly.com; ruf=mailto:60d1daacb2718@fo.dmarcly.com; sp=reject; pct=100; fo=1;
Found at
_dmarc.sheerenloo.nl
External report address
mailto:60d1daacb2718@ag.dmarcly.com (authorized)
External report address
mailto:60d1daacb2718@fo.dmarcly.com (authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
sprejectSubdomain policy
pct100Percentage of mail the policy applies to
ruamailto:60d1daacb2718@ag.dmarcly.comAggregate report addresses
rufmailto:60d1daacb2718@fo.dmarcly.comFailure 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:60d1daacb2718@ag.dmarcly.com
  • ✓ 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: default, mail, selector1, selector2, s1, s2

Found

Selectors
default, mail, selector1, selector2, s1, s2
_domainkey
NOERROR
SelectorKeyFlags
defaultRSA 2048 bitsh=sha256
mailRSA 1024 bits
selector1RSA 2048 bits
selector2RSA 1024 bits
s1RSA 2048 bits
s2RSA 1024 bits

Checks

  • ✓ Keys found: default, mail, selector1, selector2, s1, s2 #7
    DKIM keys found for this domain with selectors: default, mail, selector1, selector2, s1, s2
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: mail (1024 bits), selector2 (1024 bits), s2 (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
ECDSAP256SHA256 (13)
Key tags
17388, 39706
Signatures valid until
20 December 2026, 20:00 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 2026-12-20 #21
    DNSKEY signatures are valid until 2026-12-20T20:00:36Z.

MX

warn

1 mail server

Found

PriorityHostRecordsReverse DNS
0sheerenloo-nl.b-v1.mx.microsoftA 52.101.103.39 A 52.101.91.162 A 52.101.209.28 A 52.101.68.10 AAAA 2a01:111:f403:ca48::12 AAAA 2a01:111:f403:ca21::c AAAA 2a01:111:f403:ca3c::6 AAAA 2a01:111:f403:ca48::10mail-miypr05cu00207.inbound.protection.outlook.com ✓ mail-matpr04cu00302.inbound.protection.outlook.com ✓ mail-cpjpr05cu00104.inbound.protection.outlook.com ✓ mail-dbbpr03cu00102.inbound.protection.outlook.com ✓ mail-miypr05cu00202.inbound.protection.outlook.com ✓ mail-matpr04cu00204.inbound.protection.outlook.com ✓ mail-zrxpr04cu00106.inbound.protection.outlook.com ✓ mail-miypr05cu00100.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

pass

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

Found

MTA-STS record
v=STSv1; id=174617555572Z;
Policy URL
https://mta-sts.sheerenloo.nl/.well-known/mta-sts.txt
Mode
enforce
Allowed MX
sheerenloo-nl.b-v1.mx.microsoft
Max age
2592000 seconds
TLS-RPT record
v=TLSRPTv1; rua=mailto:60d1daacb2718@tls.dmarcly.com

DANE (TLSA records)

MX hostTLSADNSSEC
sheerenloo-nl.b-v1.mx.microsoft3 1 1 cfd68bde4129c00a… 2 0 1 ea7a25255d111fc3… 3 1 1 803f7447cc75b208… 2 0 1 c1ad7778796d20bc… 3 1 1 54883cc5f1849331…Yes

Checks

  • ✓ Record published #32
    MTA-STS record found with id 174617555572Z.
  • ✓ Policy enforced #33
    The MTA-STS policy is enforced and cached for 720h0m0s.
  • ✓ 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:60d1daacb2718@tls.dmarcly.com
  • ✓ 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