radissonblu.com

Checked 22 October 2026, 10:24 UTC · via 8.8.8.8
✗Problems found
20 passed 6 warnings 1 failed 3 info

SPF

pass

SPF record published

Found

Record
v=spf1 mx:radissonblu.com include:spf.rezidor.com include:spf.protection.outlook.com include:sendgrid.net include:spf.tmes.trendmicro.com include:spf_3a.oracleindustry.com ip4:199.167.217.90 ip4:209.242.69.231 ip4:80.196.100.205/32 ip4:80.196.100.206/32 ip4:195.78.71.30/31 ip4:213.138.147.128/27 ip4:193.180.231.67/32 ip4:54.240.88.216/30 ip4:52.208.166.252/32 ip4:54.246.247.240/28 ip4:54.77.200.126/32 ip4:54.154.234.46/32 ip4:54.72.85.15/32 ip4:23.251.238.30/31 ip4:23.251.238.32/31 ip4:216.117.108.0/24 ip4:216.117.109.0/24 ip4:216.117.110.0/24 -all
DNS lookups
10 of 10
Void lookups
0 of 2

Checks

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

p=none (_dmarc.radissonblu.com)

Found

Record
v=DMARC1; p=none; rua=mailto:protecting.rhg@radissonhotels.com; ruf=mailto:protecting.rhg@radissonhotels.com
Found at
_dmarc.radissonblu.com
External report address
mailto:protecting.rhg@radissonhotels.com (not authorized)
TagValueMeaning
vDMARC1Version
pnonePolicy
ruamailto:protecting.rhg@radissonhotels.comAggregate report addresses
rufmailto:protecting.rhg@radissonhotels.comFailure 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:protecting.rhg@radissonhotels.com
  • !
    Report address not authorized
    These report addresses are in another domain that has not agreed to receive your reports, so receivers will not send them: mailto:protecting.rhg@radissonhotels.com (needs radissonblu.com._report._dmarc.radissonhotels.com). Ask the report provider to publish the record, or check the address.
    #29

DKIM

warn

Selectors: selector1

Found

Selectors
selector1
_domainkey
NOERROR
SelectorKeyFlags
selector1RSA 1024 bits

Checks

  • ✓ Keys found: selector1 #7
    DKIM keys found for this domain with selectors: selector1
  • !
    1024-bit DKIM key
    1024-bit RSA keys are the minimum and are considered weak today: selector1 (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

1 mail server

Found

PriorityHostRecordsReverse DNS
0radissonhotels.in.tmes.trendmicro.euA 18.185.115.145 A 18.185.115.146 A 18.185.115.147in.tmes.trendmicro.eu ✓ in.tmes.trendmicro.eu ✓ in.tmes.trendmicro.eu ✓

Checks

  • ✓ 1 MX record #9
    Found 1 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: radissonhotels.in.tmes.trendmicro.eu
    #11
  • !
    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 3 MX addresss have a PTR record that resolves back to them.

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 1 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
radissonhotels.in.tmes.trendmicro.eunone-

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