sigma.nl

Checked 22 October 2026, 15:50 UTC · via 8.8.8.8
!Passed with warnings
26 passed 3 warnings 0 failed 3 info

SPF

pass

SPF record published

Found

Record
v=spf1 include:_spf.salesforce.com a:ns3436198.ip-46-105-104.eu ip4:62.250.3.58 ip4:184.106.224.21 ip4:62.250.3.110 ip4:46.105.104.173 a:Fallback.hmscontactcenters.nl include:mailgun.org ip4:213.239.137.71 ip4:231.239.137.71 ~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.sigma.nl)

Found

Record
v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com
Found at
_dmarc.sigma.nl
External report address
mailto:dmarc_rua@emaildefense.proofpoint.com (authorized)
External report address
mailto:dmarc_ruf@emaildefense.proofpoint.com (authorized)
TagValueMeaning
vDMARC1Version
prejectPolicy
ruamailto:dmarc_rua@emaildefense.proofpoint.comAggregate report addresses
rufmailto:dmarc_ruf@emaildefense.proofpoint.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:dmarc_rua@emaildefense.proofpoint.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

pass

Selectors: s1, s2

Found

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

Checks

  • ✓ Keys found: s1, s2 #7
    DKIM keys found for this domain with selectors: s1, s2
  • ✓ Strong keys #23
    DKIM keys are strong enough: s1: RSA 2048 bits; s2: RSA 2048 bits.
  • ✓ No problematic flags #24
    No keys in test mode, revoked, or limited to SHA-1.

DNSSEC

warn

Not signed

Found

DNSKEY records
No (0)
DS at parent
No

Checks

  • !
    Not enabled
    DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.
    #8

MX

warn

2 mail servers

Found

PriorityHostRecordsReverse DNS
10mx-01.mail-forwarder.ioA 5.22.145.121 A 5.22.145.16 AAAA 2a00:18e0:5:2:7577:4e4d:413b:f507 AAAA 2a00:18e0:5:3:dfe2:c743:85aa:61bcrelay.mail-forwarder.io ✓ relay.mail-forwarder.io ✓ relay.mail-forwarder.io (does not resolve back) relay.mail-forwarder.io (does not resolve back)
10mx-02.mail-forwarder.ioA 5.22.145.16 A 5.22.145.121 AAAA 2a00:18e0:5:2:7577:4e4d:413b:f507 AAAA 2a00:18e0:5:3:dfe2:c743:85aa:61bcrelay.mail-forwarder.io ✓ relay.mail-forwarder.io ✓ relay.mail-forwarder.io (does not resolve back) relay.mail-forwarder.io (does not resolve back)

Checks

  • ✓ 2 MX records #9
    Found 2 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.
  • ✓ 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 does not match
    The PTR name of these addresses does not resolve back to the same address: 2a00:18e0:5:2:7577:4e4d:413b:f507 -> relay.mail-forwarder.io, 2a00:18e0:5:3:dfe2:c743:85aa:61bc -> relay.mail-forwarder.io, 2a00:18e0:5:2:7577:4e4d:413b:f507 -> relay.mail-forwarder.io, 2a00:18e0:5:3:dfe2:c743:85aa:61bc -> relay.mail-forwarder.io.
    #30

TLS

warn

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

Found

DANE (TLSA records)

MX hostTLSADNSSEC
mx-01.mail-forwarder.ionone-
mx-02.mail-forwarder.ionone-

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