unix-solutions.be

Checked 22 October 2026, 07:21 UTC · via 8.8.8.8
✗Problems found
20 passed 6 warnings 1 failed 3 info

SPF

warn

SPF record published

Found

Record
v=spf1 include:servers.mcsv.net ip4:109.68.160.0/21 ip4:185.111.204.0/24 ip6:2a02:2a08::/32 ip6:2a04:6480::/29 mx -all
DNS lookups
2 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 2 of 10 DNS lookups #2
    SPF record needs 2 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: ip6:2a04:6480::/29. Check that you really own and send from all of them.
    #27

DMARC

fail

p=none (_dmarc.unix-solutions.be)

Found

Record
v=DMARC1; p=none; pct=0; sp=none; rua=mailto:postmaster@unix-solutions.be
Found at
_dmarc.unix-solutions.be
TagValueMeaning
vDMARC1Version
pnonePolicy
spnoneSubdomain policy
pct0Percentage of mail the policy applies to
ruamailto:postmaster@unix-solutions.beAggregate report addresses

Checks

  • ✗
    Policy: none (monitoring only)
    DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.
    #4
  • ✓ Record published #5
    DMARC record exists for this domain.
  • ✓ Valid syntax #17
    DMARC record syntax is valid.
  • ✓ Aggregate reports enabled #19
    Aggregate reports are sent to: mailto:postmaster@unix-solutions.be
  • ✓ Report addresses in own domain #29
    All report addresses are in your own organizational domain.

DKIM

warn

Selectors: k1

Found

Selectors
k1
_domainkey
NOERROR
SelectorKeyFlags
k1RSA 1024 bits

Checks

  • ✓ Keys found: k1 #7
    DKIM keys found for this domain with selectors: k1
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: k1 (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

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

3 mail servers

Found

PriorityHostRecordsReverse DNS
10zimbra01.unix-solutions.beA 109.68.160.135zimbra01.unix-solutions.be ✓
20mx20.unix-solutions.beA 185.111.204.201 AAAA 2a04:6480:101::201mx20.unix-solutions.be ✓ mx2.unix-solutions.be (does not resolve back)
30mx30.unix-solutions.beA 109.68.160.218 AAAA 2a02:2a08:102::218mx30.unix-solutions.be ✓ mx30.unix-solutions.be ✓

Checks

  • ✓ 3 MX records #9
    Found 3 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: zimbra01.unix-solutions.be
    #11
  • ✓ Redundant MX hosts #12
    Found 3 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 3 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: 2a04:6480:101::201 -> mx2.unix-solutions.be.
    #30

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 3 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
zimbra01.unix-solutions.benone-
mx20.unix-solutions.benone-
mx30.unix-solutions.benone-

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