365 AI Recipient Validation

Identify incorrect or missing recipients at the point of send.

"Adds real-time recipient checks in Microsoft 365 to reduce human-error risks before emails leave the client."

Prevent misdirected emails and accidental data exposure

Human error in email addressing remains a common source of data loss and security incidents. Misdirected messages can expose personal or sensitive information and harm reputation, particularly in regulated or high-risk sectors.

The product analyses recipient choices and message context in the Outlook client and issues immediate warnings at the point of send. It gives users a chance to correct messages and provides administrators with configurable controls and a dashboard of warning instances and user actions.

Where 365 AI Recipient Validation is used

Organisations in finance, healthcare and utilities can use the solution to reduce the risk of misdirected emails that expose sensitive data. It is useful where a single misaddressed message would have material consequences for privacy or reputation.

High-volume senders, managed service providers and organisations with multiple sending domains can deploy it to improve sender controls and protect deliverability by preventing accidental data leaks and inappropriate replies to large distribution lists.

Fits within these solutions

Data Loss Prevention

Suitable environments

Designed for Microsoft 365 tenants, the add-on runs in recent Outlook clients on Windows, Mac and the web. Analysis happens locally in the client; texts and attachments are not transmitted to Hornetsecurity servers. Deployment requires no MX changes and integrates with existing Microsoft 365 settings.

Benefits

Fewer misaddresses

Lowers the frequency of emails sent to incorrect recipients by warning users at send time.

Reduced data loss

Reduces the chance of accidental exposure of personal or sensitive information via email.

Admin visibility

Gives admins insight into warning instances and user behaviour to target awareness efforts.

Protect sender reputation

Helps maintain email deliverability and sender reputation by preventing accidental leaks and inappropriate mass replies.

Immediate correction

Allows users to correct recipient lists or content before sending, reducing remediation work post-send.

Offline support

Smart Alerts offer protection even when the client is offline, ensuring consistent user guidance.

Capabilities

Recipient analysis

Analyses recipient selection and message context in the Outlook client to detect potential misaddresses before send.

ML-based warnings

Uses machine learning on historical communications to trigger warnings for unintended or missing recipients and sensitive content.

Local processing

Performs analysis in the local Outlook client so email texts and attachments are not transmitted to vendor servers.

Real-time checks

Provides immediate, in-client warnings at the point of send and allows users to correct or proceed with the message.

Configurable rules

Administrators can disable specific warning scenarios, exclude users, and mark trusted external domains.

Admin dashboard

Gives administrators an overview of warning instances and user actions to inform awareness and controls.

Smart Alerts

Delivers side-panel alerts and supports offline functionality so users receive warnings even without continuous connectivity.

M365 integration

Integrates with Microsoft 365 and recent Outlook clients without changes to tenant MX records or core configurations.

Applications

Regulated sector safety

Mitigates misdirected email risks in finance, healthcare and utilities where data exposure has high impact.

High-volume senders

Helps organisations that send large volumes of outbound email reduce accidental leaks and mass-reply errors.

MSP tenant support

Offers managed service providers a tool to protect multiple tenants against user-addressing errors.

Multiple domains

Supports organisations with several sending domains by enabling trusted domain configuration and controls.

Prevent large replies

Reduces the risk of replying to large distribution lists and spreading sensitive data by mistake.

Awareness insight

Provides data administrators can use to target user awareness and reduce repeat errors.

Part of (depending on licence)

Resources

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