novacollege.nl

Checked 22 October 2026, 14:51 UTC · via 8.8.8.8
!Passed with warnings
26 passed 4 warnings 0 failed 3 info

SPF

warn

SPF record published

Found

Record
v=spf1 mx include:spf.protection.outlook.com ip4:62.204.93.131 ip4:207.244.98.227 ip4:83.149.98.72 ip4:81.17.56.1 ip4:83.149.98.73 ip4:13.88.226.191 ip4:40.115.66.46 ip4:13.94.232.90 ip4:191.238.213.99 ip4:51.13.102.144 ip4:178.162.177.161 ip4:13.74.56.125 ip4:4.185.96.20 ip4:20.162.206.62 ip4:172.172.139.18 ip4:4.223.229.111 ip4:185.51.192.213/32 ip4:185.51.192.82/32 ip6:2a01:b2e0:2::213/128 ip6:2a01:b2e0:2::82/128 ip4:46.31.48.0/21 ip4:37.221.216.0/21 ip4:185.136.64.0/23 ip4:185.53.16.0/22 ip4:91.197.72.0/22 ip4:194.88.230.0/23 ip4:195.137.214.0/23 ip4:135.84.216.0/22 ip4:66.240.227.0/24 ip4:63.143.59.128/25 ip4:63.143.57.128/25 ip4:216.98.158.0/24 ip4:74.63.212.0/24 ip4:52.200.59.0/24 ip4:34.245.210.0/24 ip4:34.245.210.0/24 ip4:87.233.189.160/27 ip4:87.233.196.64/27 ip4:87.233.187.16/28 ip4:87.233.143.149/28 ip4:149.210.201.157/32 ip4:54.194.237.169 ip4:147.253.222.19 include:_spf.sparkpostmail.com ip4:213.206.97.206 ip4:213.206.97.207 ip4:46.19.217.0/24 ip4:80.247.220.50 ip4:198.2.128.0/24 ip4:198.2.132.0/22 ip4:198.2.136.0/23 ip4:198.2.145.0/24 ip4:198.2.186.0/23 ip4:205.201.131.128/25 ip4:205.201.134.128/25 ip4:205.201.136.0/23 ip4:205.201.139.0/24 ip4:198.2.177.0/24 ip4:198.2.178.0/23 ip4:198.2.180.0/24 ip4:31.7.1.24 ip4:213.206.97.206 ip4:213.206.97.207 ip4:80.250.142.37 ip4:80.250.142.66 ip4:80.250.142.115 ip4:80.250.142.14 ip4:46.19.217.0/24 ip4:80.250.128.0/24 ip4:40.92.0.0/15 ip4:40.107.0.0/16 ip4:52.100.0.0/15 ip4:52.102.0.0/16 ip4:52.103.0.0/17 ip4:104.47.0.0/17 include:spf-flat.8m.nl ip4:167.89.91.217 ip4:85.17.2.229 ip4:147.253.222.19 ip4:167.89.91.217 include:spf.mailjet.com ip4:52.28.145.0 ip4:85.90.64.176/28 ip4:85.90.64.192/28 ~all
DNS lookups
6 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 6 of 10 DNS lookups #2
    SPF record needs 6 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.
  • !
    Broad IP ranges
    These ranges authorize tens of thousands of addresses or more: ip4:40.92.0.0/15, ip4:52.100.0.0/15. Check that you really own and send from all of them.
    #27

DMARC

pass

p=reject (_dmarc.novacollege.nl)

Found

Record
v=DMARC1; p=reject; rua=mailto:j8p1y.rua@portal.dmarcsaas.com, mailto:dmarc_agg@vali.email; sp=reject
Found at
_dmarc.novacollege.nl
External report address
mailto:j8p1y.rua@portal.dmarcsaas.com (authorized)
External report address
mailto:dmarc_agg@vali.email (authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
sprejectSubdomain policy
ruamailto:j8p1y.rua@portal.dmarcsaas.com, mailto:dmarc_agg@vali.emailAggregate 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:j8p1y.rua@portal.dmarcsaas.com, mailto:dmarc_agg@vali.email
  • ✓ 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: selector1, s1, s2

Found

Selectors
selector1, s1, s2
_domainkey
NOERROR
SelectorKeyFlags
selector1RSA 1024 bits
s1RSA 2048 bits
s2RSA 1024 bits

Checks

  • ✓ Keys found: selector1, s1, s2 #7
    DKIM keys found for this domain with selectors: selector1, s1, s2
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: selector1 (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
RSASHA512 (10)
Key tags
54966, 10760
Signatures valid until
15 November 2026, 01:47 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 2026-11-15 #21
    DNSKEY signatures are valid until 2026-11-15T01:47:06Z.

MX

warn

1 mail server

Found

PriorityHostRecordsReverse DNS
0novacollege-nl.mail.protection.outlook.comA 52.101.73.155 A 52.101.209.31 A 52.101.68.10 A 52.101.185.24 AAAA 2a01:111:f403:ca04::e AAAA 2a01:111:f403:ca09::24 AAAA 2a01:111:f403:ca21::8 AAAA 2a01:111:f403:ca3c::6mail-am7pr02cu00203.inbound.protection.outlook.com ✓ mail-cpjpr05cu00207.inbound.protection.outlook.com ✓ mail-dbbpr03cu00102.inbound.protection.outlook.com ✓ mail-zrxpr07cu00100.inbound.protection.outlook.com ✓ mail-db8pr02cu00106.inbound.protection.outlook.com ✓ mail-am6pr02cu00204.inbound.protection.outlook.com ✓ mail-matpr04cu00100.inbound.protection.outlook.com ✓ mail-zrxpr04cu00106.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 · no TLS-RPT · DANE on 0 of 1 MX hosts

Found

DANE (TLSA records)

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

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
    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