All data shown is public and sourced from DNS.
Last checked about 13 hours ago
nhs.uk domain score
Your domain has basic email authentication in place. Consider strengthening your configuration for better protection.
nhs.uk enforces a strict DMARC reject policy, instructing receivers to block unauthenticated emails. SPF is correctly configured with a strict policy (-all), specifying which servers may send on its behalf. A few improvements would strengthen nhs.uk's email authentication posture.
Curious how this compares? See the DMARC posture of the top 100 domains.
DMARC Check Results
45 / 50 points
Score Breakdown
DMARC check passed: properly configured
DMARC record is valid and configured correctly.
_dmarc.nhs.uk TXT Entry:
v=DMARC1; p=reject; sp=none;adkim=s;aspf=s;fo=1; rua=mailto:[email protected],mailto:[email protected]
Policy (p)
reject
DKIM Alignment (adkim)
Strict (s)
SPF Alignment (aspf)
Strict (s)
Understanding alignment modes
DKIM Alignment (adkim)
Strict mode: The DKIM signature's domain must exactly match the "From" header domain.
SPF Alignment (aspf)
Strict mode: The SPF "Return-Path" domain must exactly match the "From" header domain.
Note: When alignment parameters are not specified, DMARC defaults to relaxed mode for both DKIM and SPF alignment.
Reporting (RUA/RUF)
Aggregate Reports
External Domain Verification
Verification successful
Verification successful
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BIMI Check (default selector)
0 / 20 points
Score Breakdown
No BIMI Record Found
Publish a TXT record at default._bimi.nhs.uk with v=BIMI1, logo URL (l=) and optional verified mark certificate (a=).
SPF Record Check Results
30 / 30 points
Score Breakdown
SPF record is valid.
nhs.uk TXT SPF Entry:
v=spf1 ip4:195.104.77.0/23 ip4:10.176.129.120 ip4:10.228.178.230 ip4:194.72.83.215 ip4:194.72.83.216 ip4:194.155.93.52/31 include:esa1.hc1668-91.c3s2.iphmx.com include:esa2.hc1668-91.c3s2.iphmx.com include:spf.protection.outlook.com include:_spf.nhs.net include:spf.mandrillapp.com -all
Syntax Check
OK
DNS Lookup Count
6 / 10 max
Root-level mechanisms requiring DNS queries: 5.
Void Lookups
0 / 2 max
Default Policy
-allFail: Reject emails from unauthorized servers (recommended for production)
All Authorized IP Addresses
Grouped by DNS record source (includes and sub-includes)
nhs.uk (Root SPF Record)
This record also contains:
include:esa1.hc1668-91.c3s2.iphmx.com
include:esa2.hc1668-91.c3s2.iphmx.com
include:spf.protection.outlook.com | Microsoft 365
include:_spf.nhs.net
This record also contains:
include:spf.mandrillapp.com | Mailchimp Transactional
DNS Lookup Details
include:
esa1.hc1668-91.c3s2.iphmx.com
SPF record found
nhs.uk
TXT Record
v=spf1 ip4:139.138.61.16 -all
Processed recursively per RFC 7208
include:
esa2.hc1668-91.c3s2.iphmx.com
SPF record found
nhs.uk
TXT Record
v=spf1 ip4:139.138.60.154 -all
Processed recursively per RFC 7208
include:
spf.protection.outlook.com
| Microsoft 365
SPF record found
nhs.uk
TXT Record
v=spf1 ip4:40.92.0.0/15 ip4:40.107.0.0/16 ip4:52.100.0.0/15 ip4:52.102.0.0/16 ip4:52.103.0.0/17 ip4:104.47.0.0/17 ip6:2a01:111:f400::/48 ip6:2a01:111:f403::/49 ip6:2a01:111:f403:8000::/51 ip6:2a01:111:f403:c000::/51 ip6:2a01:111:f403:f000::/52 -all
Processed recursively per RFC 7208
include:
_spf.nhs.net
SPF record found
nhs.uk
TXT Record
v=spf1 ip4:213.161.89.71 ip4:213.161.89.72 ip4:213.161.89.73 ip4:213.161.89.103 ip4:213.161.89.104 ip4:213.161.89.105 ip4:155.231.210.221 ip4:155.231.210.253 ip4:51.140.243.175 ip4:51.132.11.4 ip4:10.13.29.0/26 ip4:10.13.31.0/26 ip4:10.13.29.96/27 ip4:10.13.31.96/27 ip4:155.231.208.0/27 ip4:155.231.208.128/27 include:spf.protection.outlook.com -all
Processed recursively per RFC 7208
include:
spf.protection.outlook.com
| Microsoft 365
Circular reference detected
_spf.nhs.net
include:
spf.mandrillapp.com
| Mailchimp Transactional
SPF record found
nhs.uk
TXT Record
v=spf1 ip4:198.2.128.0/24 ip4:198.2.132.0/22 ip4:198.2.136.0/23 ip4:198.2.145.0/24 ip4:198.2.186.0/23 ip4:205.201.131.0/24 ip4:205.201.134.128/25 ip4:205.201.136.0/23 ip4:205.201.139.0/24 ip4:198.2.177.0/24 ip4:198.2.178.0/23 ip4:198.2.180.0/24 ~all
Processed recursively per RFC 7208
TLS Security
0 / 10 points
Score Breakdown
TLS-RPT (Reporting)
TLS-RPT Not Configured
Publish a TXT record at _smtp._tls.nhs.uk with v=TLSRPTv1 and reporting URI (rua=).
MTA-STS (Policy)
MTA-STS Not Configured
Publish a TXT record at _mta-sts.nhs.uk with v=STSv1 and policy ID (id=).
Protect inbound transport
You've checked your outbound authentication. But without MTA-STS and TLS-RPT, mail delivered to nhs.uk isn't protected against transport downgrade attacks. Receiver Shield helps you deploy, monitor, and safely enforce transport security.
Know when your DNS records change
The check you just ran shows your current configuration. But DNS records change, sometimes without you knowing. A well-meaning IT change, a third-party provider update, or an unauthorized modification can break your email delivery overnight.
Configuration Drift
IT changes that accidentally break authentication
Provider Updates
Third-party services changing their SPF includes
Unauthorized Changes
Attackers modifying records to send as you
DMARCTrust monitors your DNS records continuously. When something changes, you get an email alert with exactly what changed and why it matters. No more surprises when customers complain their emails bounced.
Email Security Configuration
How nhs.uk configures email authentication
v=DMARC1; p=reject; sp=none;adkim=s;aspf=s;fo=1; rua=mailto:[email protected],mailto:[email protected]
v=spf1 ip4:195.104.77.0/23 ip4:10.176.129.120 ip4:10.228.178.230 ip4:194.72.83.215 ip4:194.72.83.216 ip4:194.155.93.52/31 include:esa1.hc1668-91.c3s2.iphmx.com include:esa2.hc1668-91.c3s2.iphmx.com include:spf.protection.outlook.com include:_spf.nhs.net include:spf.mandrillapp.com -all
Change History
Configuration changes will appear here when detected
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About This Checker
What we check
We analyze your domain's email authentication: DMARC policy and alignment, SPF record and includes, and BIMI logo and certificate status when present.
Why it matters
Healthy authentication improves delivery and blocks spoofing. Major inbox providers increasingly expect DMARC and aligned SPF/DKIM from senders.
Included features
- DMARC syntax, policy, and reporting validation
- SPF record evaluation and include analysis
- DKIM/SPF alignment interpretation
- BIMI record and VMC detection
- Clear setup and remediation guidance
Monitor your email authentication 24/7
This check shows a snapshot. With DMARCTrust, you get continuous monitoring of your DMARC reports and DNS records, with instant alerts when something changes.