isala.nl

Checked 22 October 2026, 14:00 UTC · via 8.8.8.8
!Passed with warnings
23 passed 5 warnings 0 failed 3 info

SPF

pass

SPF record published

Found

Record
v=spf1 ip4:194.104.113.254 ip4:80.79.108.80 ip4:80.79.99.86 ip4:84.241.182.230 ip4:194.151.228.10 ip4:195.238.86.0/23 ip4:213.75.63.33 ip4:217.19.238.48/29 ip4:45.152.249.9 ip4:45.152.250.86 ip4:84.241.175.102 ip4:85.10.129.62 ip4:85.10.128.119 ip4:85.10.143.243 ip4:85.10.150.43 ip4:185.122.116.58/32 ip4:185.122.116.57/32 ip4:83.149.98.72/30 ip4:92.42.235.0/24 ip4:34.252.27.239/32 ip4:34.249.196.78/32 ip4:34.251.157.56/32 ip4:31.7.4.94 ip4:149.72.44.245 ip4:185.173.22.200 ip6:2001:1690:100:3f00::1:4c ip6:2a03:9700:8000::4:94 include:spf.protection.outlook.com include:ip4.spf.perplex.hosting include:spf.topdesk.net include:_spf.mail.services.bastion365.net ~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.
  • ✓ No overly broad IP ranges #27
    All ip4/ip6 ranges are narrow enough.

DMARC

warn

p=quarantine (_dmarc.isala.nl)

Found

Record
v=DMARC1; p=quarantine; pct=50; adkim=r; aspf=r; fo=1; rua=mailto:rua+isala.nl@dmarc.barracudanetworks.com; ruf=mailto:ruf+isala.nl@dmarc.barracudanetworks.com
Found at
_dmarc.isala.nl
External report address
mailto:rua+isala.nl@dmarc.barracudanetworks.com (authorized)
External report address
mailto:ruf+isala.nl@dmarc.barracudanetworks.com (authorized)
TagValueMeaning
vDMARC1Version
pquarantinePolicy
pct50Percentage of mail the policy applies to
ruamailto:rua+isala.nl@dmarc.barracudanetworks.comAggregate report addresses
rufmailto:ruf+isala.nl@dmarc.barracudanetworks.comFailure report addresses
adkimrDKIM alignment (r = relaxed, s = strict)
aspfrSPF alignment (r = relaxed, s = strict)
fo1Failure reporting options

Checks

  • !
    Policy: quarantine
    DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.
    #4
  • ✓ Record published #5
    DMARC record exists for this domain.
  • ✓ Valid syntax #17
    DMARC record syntax is valid.
  • !
    Applies to 50% of mail
    DMARC policy only applies to 50% of failing mail (pct=50). Raise pct to 100 once you are confident in your setup.
    #18
  • ✓ Aggregate reports enabled #19
    Aggregate reports are sent to: mailto:rua+isala.nl@dmarc.barracudanetworks.com
  • ✓ Subdomain policy: quarantine #20
    Subdomains are covered by policy 'quarantine'.
  • ✓ External report addresses authorized #29
    Report addresses in other domains have published their authorization.

DKIM

warn

No keys found under the checked selectors

Found

Selectors
None found
_domainkey
NOERROR

Checks

  • !
    No key under common selectors
    The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.
    #7

DNSSEC

pass

Signed, DS published at parent

Found

DNSKEY records
Yes (2)
DS at parent
Yes
Algorithms
ECDSAP256SHA256 (13)
Key tags
14452, 25562
Signatures valid until
5 November 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 2026-11-05 #21
    DNSKEY signatures are valid until 2026-11-05T00:00:00Z.

MX

warn

2 mail servers

Found

PriorityHostRecordsReverse DNS
10d339600.a.ess.de.barracudanetworks.comA 18.185.115.251 A 18.185.115.252 A 18.185.115.250mail.ess.de.barracuda.com ✓ mail.ess.de.barracuda.com ✓ mail.ess.de.barracuda.com ✓
20d339600.b.ess.de.barracudanetworks.comA 18.185.115.251 A 18.185.115.250 A 18.185.115.252mail.ess.de.barracuda.com ✓ mail.ess.de.barracuda.com ✓ mail.ess.de.barracuda.com ✓

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: d339600.a.ess.de.barracudanetworks.com, d339600.b.ess.de.barracudanetworks.com
    #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 6 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 2 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
d339600.a.ess.de.barracudanetworks.comnone-
d339600.b.ess.de.barracudanetworks.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