Email breaks quietly when it's misconfigured

Why email feels risky

• •Multiple protocols interact in non-obvious ways
• •Receivers decide what happens to your mail, not you
• •Failures often don't show up in logs
• •Tightening policies feels like pulling a live wire

If you've ever hesitated before changing a mail DNS record,
you already know this feeling.

Confidence comes from external feedback

MailShield collects signals from outside your infrastructure (like DMARC aggregate reports) to show you how receivers actually see your mail.

Not assumptions.
Not “probably fine”.
Real-world feedback from the systems that matter.

From uncertainty to control

• •Parses and analyzes DMARC aggregate reports
• •Shows who is sending mail on your behalf
• •Detects alignment issues and policy risks
• •Monitors SPF, DKIM, TLS, MTA-STS and BIMI
• •Catches regressions after changes

But it doesn't stop at reporting.

Guided implementation, not documentation

MailShield doesn't just say what's wrong. It tells you what to do next:

• “Set these two DNS records to enable MTA-STS”
• “Upload your BIMI logo and publish this record”
• “Your DMARC policy is safe to move to quarantine”
• “This sender breaks alignment. Here's why.”

Clear steps. Exact DNS records. Explanations and trade-offs.

You stay in control.

Designed to avoid foot-guns

• •No automatic DNS changes
• •No silent policy upgrades
• •Clear explanations before every step
• •Opinionated, but cautious by design

MailShield helps you make changes with confidence, not blind trust.

Built for people who run mail servers

• •Hosting providers
• •MSPs
• •Mail & infrastructure administrators

Designed for real-world Postfix, Exim and Exchange setups.
Including the messy ones.

Early access

MailShield is under active development and already used on real mail infrastructures.

Early users get:

• •Founder pricing
• •Direct influence on features and priorities
• •Personal support during rollout