What does the free Mailsec checkup analyze?

It checks MX records, SPF, DMARC, common DKIM selectors, domain age, nameservers, DNSSEC, CAA, BIMI, MTA-STS, TLS-RPT, and whether your mail server IPs appear on several public blocklists.

Is the checkup the same as Mailsec inbox protection?

No. The checkup is a one-time domain assessment. Mailsec integration adds per-message scoring, sender warnings, and content analysis inside your mailbox.

Do you store the domains I check?

The check runs against public DNS for immediate results. We do not present this tool as long-term domain monitoring — Mailsec integration covers ongoing protection.

How is Mailsec priced?

Mailsec is billed per protected mailbox per month. Choose Advanced Checks for rule-based inbox protection, or Advanced + AI for the same capabilities with AI-enhanced threat detection and coaching on top.

ReefSecure Mailsec

Run a free email security checkup on your domain — then see how Mailsec brings scoring and protection into every message in your mailbox.

Run Free Checkup See Mailsec in Action

Free Domain Security Checkup

Enter your company domain or a work email address. We analyze SPF, DKIM, DMARC, MX configuration, domain age, nameservers, DNSSEC, CAA, transport security signals, and whether your mail servers appear on common blocklists.

0 Security score

Grade: -

How to fix failed checks

Strong DNS is only part of the story

Phishing, invoice fraud, and credential theft still reach inboxes through lookalike domains, urgent payment requests, and messages that pass basic authentication checks. Your users need clear warnings before they click, reply, or open attachments.

Improve this with our team See inbox protection

Beyond the free checkup

Security scoring on every email

The free checkup shows where your domain stands today. ReefSecure Mailsec integrates into your mailbox so every incoming message gets a security score, clear reasons, and actionable guidance — before users click, reply, or open attachments.

Inbox — Accounts Payable

Subject URGENT: Updated bank details for invoice #8842

From Finance Team <payables@acme-suppl1er.com>

To you@yourcompany.com

ReefSecure Mailsec

High risk

External sender — first contact from this domain
Lookalike domain resembles a known supplier
Urgent payment language detected in subject and body
Link flagged: shortened URL in payment instructions

Tip: Verify bank detail changes by phone using a number from your vendor contract, not this email.

Hello,

Please update our banking information before end of day so invoice #8842 can be paid without delay. Use the secure link below to confirm the new account details.

https://bit.ly/acme-pay-update

Regards,
Finance Team

Illustrative example — not a real message.

Inbox integration

Scores and tips appear where your team already works — no separate portal required.

Layered protection

Combine authentication checks, sender intelligence, and content analysis in one flow.

Human-ready alerts

Help employees spot fraud faster with context, not just technical DNS jargon.

Per-message risk scoring with explanations employees can understand
Warnings for external senders, lookalike domains, and display-name spoofing
Content analysis for phishing patterns, urgent payment requests, and suspicious links
Link and attachment scanning before users interact with risky content
Ongoing domain authentication monitoring for SPF, DKIM, and DMARC

View Mailsec Pricing Contact Us

Mailsec Pricing

Simple per-mailbox pricing. Billed monthly — scale protection with your team.

Advanced Checks

Core Protection

EUR 4 / mailbox / month

Rule-based inbox security

Per-message risk scoring with clear explanations
External sender and lookalike domain warnings
Content analysis for phishing patterns and urgent payment language
Link and attachment scanning before users interact
Ongoing SPF, DKIM, and DMARC monitoring

Choose Advanced Checks

Advanced + AI

Recommended

EUR 6 / mailbox / month

Everything in Advanced, plus AI

All Advanced Checks capabilities included
AI-enhanced threat detection on message content
Smarter classification of BEC, invoice fraud, and social engineering
Context-aware coaching tips tailored to each message
Priority analysis for high-risk senders and conversation threads

Choose Advanced + AI

Pricing is per protected mailbox per month. Contact us for rollout planning and Microsoft 365 integration.

Contact Us

Get in Touch

Want Mailsec integrated into your mailbox with continuous scoring and protection? We can help you move from a one-time checkup to ongoing email security.

Discuss your rollout Schedule a demo Request a rollout plan