vertiv.com

Checked 22 October 2026, 11:21 UTC · via 8.8.8.8
!Passed with warnings
26 passed 4 warnings 0 failed 2 info

SPF

pass

SPF record published

Found

Record
v=spf1 ip4:204.92.21.0/25 ip4:66.48.80.0/25 ip4:160.34.15.16/28 ip4:138.1.49.41 ip4:147.154.9.180 ip4:138.1.55.48 ip4:130.35.98.1 ip4:54.186.193.102 ip4:52.222.73.120 ip4:52.222.73.83 ip4:52.222.62.51 ip4:52.222.75.85 ip4:129.213.108.188 ip4:129.213.52.209 ip4:198.2.132.142 ip4:148.163.143.101 ip4:148.163.147.152 ip4:198.22.41.64 ip4:81.88.48.78 ip4:81.88.48.66 ip4:129.145.79.0/24 ip4:204.92.19.0/24 ip4:204.92.22.0/24 ip4:204.92.26.0/24 ip4:204.92.31.0/24 ip4:204.92.114.0/24 ip4:209.17.48.0/24 ip4:209.17.49.0/24 ip4:209.17.50.0/24 ip4:209.167.231.0/24 ip4:144.191.0.0/16 ip4:142.0.160.0/20 ip4:68.232.128.0/20 ip4:129.145.16.0/21 ip4:141.145.8.0/21 ip4:129.91.16.0/21 ip4:129.145.76.0/22 ip4:139.60.152.0/22 ip4:162.247.216.0/22 include:spf.protection.outlook.com include:spf_c.oracle.com include:spf_a.oracle.com include:spf_s1.oraclecloud.com include:_spf.zycus.com include:rp.oracleemaildelivery.com -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

warn

p=quarantine (_dmarc.vertiv.com)

Found

Record
v=DMARC1; p=quarantine; fo=1; rua=mailto:a305296d@in.mailhardener.com; ruf=mailto:a305296d@in.mailhardener.com
Found at
_dmarc.vertiv.com
External report address
mailto:a305296d@in.mailhardener.com (authorized)
TagValueMeaning
vDMARC1Version
pquarantinePolicy
ruamailto:a305296d@in.mailhardener.comAggregate report addresses
rufmailto:a305296d@in.mailhardener.comFailure report addresses
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 100% of mail #18
    DMARC policy applies to all failing mail.
  • ✓ Aggregate reports enabled #19
    Aggregate reports are sent to: mailto:a305296d@in.mailhardener.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

pass

Selectors: selector1, selector2

Found

Selectors
selector1, selector2
_domainkey
NOERROR
SelectorKeyFlags
selector1RSA 2048 bits
selector2RSA 2048 bits

Checks

  • ✓ Keys found: selector1, selector2 #7
    DKIM keys found for this domain with selectors: selector1, selector2
  • ✓ Strong keys #23
    DKIM keys are strong enough: selector1: RSA 2048 bits; selector2: 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

1 mail server

Found

PriorityHostRecordsReverse DNS
0vertiv-com.mail.protection.outlook.comA 52.101.8.35 A 52.101.10.16 A 52.101.60.173 A 52.101.40.28 AAAA 2a01:111:f403:c918:: AAAA 2a01:111:f403:f909::4 AAAA 2a01:111:f403:c922::6 AAAA 2a01:111:f403:f804::3mail-ds2pr05cu00103.inbound.protection.outlook.com ✓ mail-bn6pr21cu00500.inbound.protection.outlook.com ✓ mail-bn3pr0501cu00105.inbound.protection.outlook.com ✓ mail-cy1pr02cu00104.inbound.protection.outlook.com ✓ mail-byapr04cu00400.inbound.protection.outlook.com ✓ mail-bn0pr03cu00304.inbound.protection.outlook.com ✓ mail-bl2pr02cu00506.inbound.protection.outlook.com ✓ mail-co1pr03cu00403.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 · TLS-RPT · DANE on 0 of 1 MX hosts

Found

TLS-RPT record
v=TLSRPTv1; rua=mailto:a305296d@in.mailhardener.com

DANE (TLSA records)

MX hostTLSADNSSEC
vertiv-com.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
  • ✓ Reports enabled #35
    TLS reports are sent to: mailto:a305296d@in.mailhardener.com
  • 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