Email security for every domain you manage
MSPs and hosting providers use MailShield to monitor SPF, DKIM, DMARC and five other protocols across every client domain — with prioritized fixes, hosted MTA-STS, and zero risk of breaking mail flow. We never touch your DNS.
SPF · DKIM · DMARC · MTA-STS · TLS-RPT · BIMI · DNSSEC · DANE
The risks across every domain you manage
Email security fails silently. Across a fleet of client domains, the odds that something is broken right now are high — and you'd find out from a support ticket, not a tool.
- A client's emails start landing in spam and you find out from a support ticket, not a tool
- Attackers spoof a domain you manage, and the blame lands on your team
- One DNS change on one of fifty domains silently breaks delivery for weeks
- You can't prove to a client that their email security is actually working
Finally, visibility into every client domain
Google, Microsoft and every other receiver are making decisions about your clients' emails right now: delivering them, flagging them as spam, or rejecting them entirely. MailShield shows you what they see — on every domain you manage — so you can act before a client opens a ticket.
Not assumptions. Not "probably fine." Real data from the systems that decide whether your clients' emails arrive.
Google passed your DMARC check
1,247 emails authenticated successfully today
Unknown sender detected
IP 198.51.100.42 sent 23 emails as your domain
SPF record changed
Lookup count increased from 8 to 11 (over limit)
From scattered domains to a single source of truth
And MailShield doesn't stop at monitoring.
Every domain, one dashboard
Add your domains and see their security posture in seconds. Scores, protocol status, and issues, all on one screen. Group by team, filter by tag, and know exactly which domains need attention without checking them one by one.
Aggregate reports, zero effort
DMARC and TLS reports are processed automatically as they arrive. See volume trends, passing vs. failing ratios, and which senders are using your domain, without parsing XML yourself.
Stay ahead of every change
Get notified when your security score changes, DNS records are modified, or new DMARC reports arrive. Catch configuration drift and unauthorized senders before they cause deliverability problems.
One dashboard for every client, every protocol
Stop juggling spreadsheets and ad-hoc checks across dozens of client domains. MailShield monitors all eight critical protocols on every domain you manage, with clear recommendations on what to fix first.
Complete Protocol Coverage
All eight email security protocols monitored continuously. Know the moment a change breaks your authentication, before it affects delivery.
Automatic Report Processing
We receive and analyze your DMARC reports automatically. See who's sending email as your domain and spot unauthorized senders instantly.
Instant Security Score
A single score that tells your entire team where you stand. Share it with leadership, track it over time, and celebrate when it improves.
Hosted MTA-STS
We host the MTA-STS policy and certificate for every client domain. Two DNS records each, no web server, no renewal chores. The single chore an MSP hates doing fifty times.
Real-Time Alerts
Score drops, DNS changes, authentication failures: get notified the moment something needs attention, not weeks later.
Built for Agencies & MSPs
Group domains by client, assign roles to staff, and keep clean separation between accounts. White-label-ready scores you can hand to clients each month.
We tell you exactly what needs fixing
No guesswork. No hunting through documentation. MailShield gives you specific, actionable next steps:
Specific steps. Ready-to-use records. Clear explanations of what each change does and why.
You stay in control.
Your email, your control
Other tools make changes behind your back. MailShield gives you recommendations. You decide what to implement and when.
- We never touch your DNS. You approve every change
- No silent policy upgrades that could break your mail flow
- Every recommendation comes with a clear explanation of why and what happens next
- Built for production environments where mistakes have real consequences
Built for
- Hosting providers managing email for hundreds of clients
- MSPs responsible for their customers' email reputation
- IT teams who need to prove email compliance to leadership
Trusted by teams running real-world infrastructure, including the complex setups.
How It Works
Add Your Domain
Enter your domain and get an instant security assessment across all eight email protocols, in under a minute.
See Where You Stand
Get a clear security score with a breakdown of what's working and what needs immediate attention.
Fix & Monitor
Follow step-by-step recommendations to fix issues, then let MailShield monitor continuously and alert you to changes.
Score every client domain in 60 seconds
Add your first domains and instantly see what's working, what's broken, and exactly how to fix it — on every domain you manage. No credit card required.
Start free with 1 domain. No credit card required.