readshop.nl

Checked 22 October 2026, 15:40 UTC · via 8.8.8.8
✗Problems found
20 passed 3 warnings 1 failed 3 info

SPF

pass

SPF record published

Found

Record
v=spf1 a:smtp.nextgenerationnetworks.nl include:_spf.online.superoffice.com include:spf.smtp2go.com ip4:80.237.245.226 include:_spf.google.com include:spf.flowmailer.net ip4:145.255.128.26 ip4:145.255.128.27 ip4:194.109.24.0/24 ip4:194.109.127.0/24 ip4:185.87.249.232 ip4:185.87.249.222 ip4:212.41.136.65/26 ip4:92.63.168.192 ip4:92.63.169.41 ip4:92.63.172.137 ip4:92.63.171.134 a ~all
DNS lookups
7 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 7 of 10 DNS lookups #2
    SPF record needs 7 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

fail

No DMARC record found

Checks

  • ✗
    No DMARC record
    No DMARC record was found for this domain. DMARC is essential for preventing email spoofing. Add a DMARC record with p=reject or at least p=quarantine.
    #5

DKIM

warn

Selectors: dkim, google

Found

Selectors
dkim, google
_domainkey
NOERROR
SelectorKeyFlags
dkimRSA 1024 bits
googleRSA 2048 bits

Checks

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

Signed, DS published at parent

Found

DNSKEY records
Yes (3)
DS at parent
Yes
Algorithms
ECDSAP256SHA256 (13)
Key tags
64537, 58649, 47528
Signatures valid until
24 October 2026, 20:20 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 expire in 53h0m0s
    DNSKEY signatures expire at 2026-10-24T20:20:50Z (in 53h0m0s). Check that re-signing works.
    #21

MX

pass

5 mail servers

Found

PriorityHostRecordsReverse DNS
1aspmx.l.google.comA 142.251.127.26 AAAA 2a00:1450:4001:c21::1blcfrai-in-f26.1e100.net ✓ lcfrai-in-f27.1e100.net ✓
5alt1.aspmx.l.google.comA 142.250.147.27 AAAA 2a00:1450:4013:c1e::1ard-in-f27.1e100.net ✓ yugrqzs-in-f26.1e100.net ✓
5alt2.aspmx.l.google.comA 172.253.152.27 AAAA 2a00:1450:4010:c22::1byulpptr-in-f27.1e100.net ✓ yulpptr-in-f27.1e100.net ✓
10alt3.aspmx.l.google.comA 192.178.228.27 AAAA 2404:6800:4000:1027::1byuskelf-in-f27.1e100.net ✓ ncboms-in-f27.1e100.net ✓
10alt4.aspmx.l.google.comA 192.178.158.27 AAAA 2404:6800:4013:813::1blcdels-in-f27.1e100.net ✓ lcdels-in-f27.1e100.net ✓

Checks

  • ✓ 5 MX records #9
    Found 5 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 5 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 5 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 10 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 5 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
aspmx.l.google.comnone-
alt1.aspmx.l.google.comnone-
alt2.aspmx.l.google.comnone-
alt3.aspmx.l.google.comnone-
alt4.aspmx.l.google.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