Mail domain report: royalmail.com

SPF

pass

SPF record published

Found

Record: v=spf1 ip4:157.203.56.0/22 ip4:208.72.90.64/26 ip4:134.213.149.92/32 ip4:144.87.143.0/24 ip4:146.101.28.221/32 ip4:147.29.39.0/24 ip4:157.203.0.0/27 ip4:20.90.138.231/32 ip4:185.29.44.6/32 ip4:191.233.96.0/20 ip4:194.140.251.4/32 ip4:208.185.235.44/32 ip4:209.135.36.206/32 ip4:209.167.231.208/26 ip4:212.64.130.137/32 ip4:217.64.224.67/32 ip4:35.157.226.52/32 ip4:94.46.185.189/32 ip4:52.50.253.173/32 ip4:54.171.224.250/32 ip4:62.209.53.0/24 ip4:79.125.0.0/17 ip4:81.138.21.4/32 ip4:81.171.203.0/24 ip4:82.147.17.34/32 ip4:94.126.110.195/32 ip4:146.177.43.198/32 ip4:5.61.115.80/26 ip4:217.64.233.50 ip4:217.64.233.52 ip4:81.149.233.242 ip4:162.13.103.194 ip4:149.72.233.190 ip4:149.72.224.180 ip4:35.214.208.81/32 ip4:35.214.213.218/32 ip4:35.214.183.81/32 ip4:213.52.186.141/32 ip4:213.52.186.142/32 ip4:35.214.212.238/32 ip4:129.152.0.0/17 ip4:85.158.136.0/21 ip4:195.245.230.0/23 ip4:67.219.240.0/20 ip4:5.61.115.32/28 include:spf.mandrillapp.com include:amazonses.com include:spf.protection.outlook.com include:_spf.salesforce.com -all
DNS lookups: 5 of 10
Void lookups: 0 of 2

Checks

✓ No deprecated ptr mechanism #1

No ptr mechanism found in SPF record.
✓ 5 of 10 DNS lookups #2

SPF record needs 5 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.royalmail.com)

Found

Record: v=DMARC1; p=reject; rua=mailto:f5755cf71b04029@rep.dmarcanalyzer.com; ruf=mailto:f5755cf71b04029@for.dmarcanalyzer.com; fo=1
Found at: _dmarc.royalmail.com
External report address: mailto:f5755cf71b04029@rep.dmarcanalyzer.com (authorized)
External report address: mailto:f5755cf71b04029@for.dmarcanalyzer.com (authorized)

Tag	Value	Meaning
v	DMARC1	Version
p	reject	Policy
rua	mailto:f5755cf71b04029@rep.dmarcanalyzer.com	Aggregate report addresses
ruf	mailto:f5755cf71b04029@for.dmarcanalyzer.com	Failure report addresses
fo	1	Failure 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:f5755cf71b04029@rep.dmarcanalyzer.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

warn

Selectors: selector1, s1, s2

Found

Selectors: selector1, s1, s2
_domainkey: NOERROR

Selector	Key	Flags
selector1	RSA 2048 bits
s1	RSA 2048 bits
s2	RSA 1024 bits

Checks

✓ Keys found: selector1, s1, s2 #7

DKIM keys found for this domain with selectors: selector1, s1, s2
!

1024-bit DKIM key

1024-bit RSA keys are the minimum and are considered weak today: s2 (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

Priority	Host	Records	Reverse DNS
10	royalmail-com.mail.protection.outlook.com	A 52.101.103.39 A 52.101.209.153 A 52.101.68.27 A 52.101.103.143 AAAA 2a01:111:f403:ca48::a AAAA 2a01:111:f403:ca48::12 AAAA 2a01:111:f403:ca04::a AAAA 2a01:111:f403:ca04::e	mail-miypr05cu00207.inbound.protection.outlook.com ✓ mail-cpjpr04cu00101.inbound.protection.outlook.com ✓ mail-db7pr03cu00503.inbound.protection.outlook.com ✓ mail-miypr03cu00107.inbound.protection.outlook.com ✓ mail-miypr02cu00202.inbound.protection.outlook.com ✓ mail-miypr05cu00202.inbound.protection.outlook.com ✓ mail-du0pr03cu00102.inbound.protection.outlook.com ✓ mail-db8pr02cu00106.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 · no TLS-RPT · DANE on 0 of 1 MX hosts

Found

DANE (TLSA records)

MX host	TLSA	DNSSEC
royalmail-com.mail.protection.outlook.com	none	-

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