Email authentication
Validate SPF, DKIM, DMARC, BIMI, MX records, SMTP reachability, MTA-STS, TLS-RPT, and mail-server TLS.
DomainShield Tower · Your watchtower for domain and email security
Know what protects your domain.
Fix what does not.
Check DNS, email authentication, SSL, website security headers, public blocklists, and domain registration in one clear report—then keep watching what changes.
No account required. Results are checked live and are not a substitute for a full security assessment.
SPF & DMARCDKIM & BIMISSL & headersMX & mail TLSBlocklists
One clear security picture
See what is protecting your domain.
DomainShield Tower checks the systems your business depends on and explains what to fix next.
DNS integrity
Review nameservers, propagation consistency, reverse DNS, and conflicting records.
Website protection
Check HTTPS redirects, certificate trust, certificate expiry, security headers, and website availability.
Reputation signals
Identify public blocklist listings and domain registration issues before they disrupt users.
Explore the toolkit
Tools for every domain and email control.
Use the public tools when you need a focused check, or start with the full health scan above.
Simple by design
From scan to action in three steps.
Enter your domain
No DNS access or technical setup is required for a public scan.
Run the checks
We inspect public DNS, email, SSL, website, and reputation signals.
Fix with confidence
Get plain-language findings, a score, and a report you can share.
Built for teams
Stay ahead of problems that cost trust.
Use DomainShield Tower for a one-time health check or sign in to monitor a portfolio across workspaces.
- Plain-language explanations and guided remediation
- DMARC aggregate reporting and sending-source visibility
- Alerts, downloadable reports, team roles, and weekly monitoring
Ready to check your domain?
Start with a free live scan. No account required.
Check domain securityOne platform, many use cases
Security visibility for every team.
Make domain and email health understandable for the people who own infrastructure, risk, and reputation.
IT and security teams
Prioritize authentication gaps, investigate unexpected senders, and keep evidence for reviews.
MSPs and consultants
Manage customer domains in separate workspaces and deliver consistent, branded reports.
Business owners
Understand the risks behind a score without needing to become a DNS or email specialist.
Read-only by defaultPublic checks never change your DNS.
Actionable findingsEvery result explains what to do next.
Workspace isolationCustomer data stays separated by tenant.
Built for continuityHistory, monitoring, and weekly reports.
Questions, answered
Frequently asked questions.
Is the public scan free?
Yes. You can run a live scan without creating an account. Sign in when you want history, workspaces, and scheduled monitoring.
Can the scan change my DNS?
No. DomainShield Tower reads publicly available records and does not make changes to your domain or mail system.
Can I monitor more than one domain?
Yes. Create a workspace and add monitored domains according to your plan.
What should I do with a failed check?
Open the finding in your report for the reason, affected record, and a practical next step.