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Mimecast Secure Messaging
What Mimecast Secure Messaging is
Mimecast Secure Messaging helps organizations protect sensitive information sent by email, including financial records and customer data. Messages are delivered through a secure web portal, and Mimecast says the information remains in its cloud. Senders can set read receipts and expiry dates and restrict printing or replies. Mimecast says messages and attachments are scanned for viruses, checked against data leak prevention policies and held in an AES-encrypted archive. Recipients use the portal to retrieve messages, download attachments and reply securely. Email gateway policies can trigger secure delivery; for Office 365, encryption can also be triggered by administrator-defined criteria such as recipient, domain or subject keywords when TLS is unavailable. Senders and recipients do not need extra software downloads or hardware. The service is listed for Android, iOS, macOS, web and Windows, and includes Outlook integration and administrative access controls. The End User Portal beta is limited to customers with access to Mimecast end-user applications, and is included only in packages that already include those applications. Pricing is on request. Mimecast was founded in 2003 and is headquartered in London.
Who it suits
Secure Messaging suits organizations that send sensitive information to colleagues or partners by email and want portal-based access controls. It is intended as part of Mimecast’s business email subscription offering.
What it does well
- Senders can set expiry dates and read receipts
- Recipients can retrieve messages and reply through a portal
- Messages and attachments are checked for viruses and data-leak policies
- No extra software downloads or hardware are required
- Available across mobile, desktop and web platforms
What to know first
- Pricing is available on request
- The End User Portal is limited to eligible customers and packages
Limits
End User Portal beta access is limited to customers with access to Mimecast end-user applications, and the portal is included only in service packages that already include those applications.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Advanced | Securely send messages and large files · Email security with data protection · Email continuity | On request |
| Premium | Securely send messages and large files · Comprehensive protection across collaboration tools · Email continuity | On request |
| Critical | Contact for pricing · Securely send messages and large files (Cloud Gateway) | On request |
As mimecast.com lists them, read 20 Sept 2026. The maker's own page has the final word.
Getting started
- Visit the Mimecast Secure Messaging website.
- Contact Mimecast for pricing and service-package details.
- Use the secure web portal to send and receive protected messages.
- Set message options such as expiry, read receipts and printing or reply restrictions.
Verdict
Mimecast Secure Messaging provides portal delivery with sender controls and automated policy triggers for sensitive email. Confirm that the required End User Portal access is included in the service package before choosing it.
Questions
How much does Mimecast Secure Messaging cost?
Pricing is on request.
Which platforms does it support?
The listed platforms are Android, iOS, macOS, web and Windows. The End User Portal announcement also describes access on ChromeOS through current Chrome, Edge, Firefox or Safari browsers.
How do recipients open a protected message?
Recipients receive instructions to log in to the secure web portal. They can retrieve the message, download attachments and reply securely.
Does it integrate with Outlook?
Yes. Outlook integration is listed.
Do users need to install software or hardware?
Mimecast says senders and recipients do not need additional software downloads or hardware.
Who makes Mimecast Secure Messaging?
The maker is Mimecast Secure Messaging, headquartered in London, United Kingdom, and founded in 2003.
Facts from Mimecast Secure Messaging's own pages
- Access limit
- The End User Portal beta is open to customers with access to Mimecast end-user applications, and the portal is included only in service packages that already include those applications. · community.mimecast.com, 7 Oct 2026
- Admin access controls
- Yes · mimecast.com, 20 Sept 2026
- Cloud portal
- Protected messages are sent and received through a secure email web portal, and Mimecast says the sensitive information never leaves its cloud. · mimecast.com, 7 Oct 2026
- Founded
- 2003 · mimecast.com, 28 Sept 2026
- Headquarters
- London, United Kingdom · mimecast.com, 28 Sept 2026
- Intended users
- Mimecast describes the service as part of its business email subscription offering for organizations sharing sensitive information with colleagues and partners. · mimecast.com, 7 Oct 2026
- Message expiry
- Yes · mimecast.com, 20 Sept 2026
- Message processing
- Mimecast says messages and attachments are scanned for viruses, checked against data leak prevention policies, and stored in an AES-encrypted archive. · mimecast.com, 7 Oct 2026
- Office 365
- Mimecast says Secure Messaging can protect Office 365 email when TLS is unavailable and can trigger encryption based on administrator-defined criteria such as recipient, domain, or subject keywords. · mimecast.com, 7 Oct 2026
- Outlook integration
- Users can compose a message in Outlook and select Send Secure in the Mimecast for Outlook tab. · mimecast.com, 7 Oct 2026
- Policy automation
- Secure Messaging can be initiated when an email matches policies applied at the email security gateway. · mimecast.com, 7 Oct 2026
- Portal availability
- Mimecast announced Secure Messaging in its browser-based End User Portal, with access across Windows, macOS, iOS, Android, and ChromeOS using current Chrome, Edge, Firefox, or Safari browsers. · community.mimecast.com, 7 Oct 2026
- Purpose
- Secure Messaging helps organizations protect sensitive information sent by email, including financial records and customer data. · mimecast.com, 7 Oct 2026
- Recipient access
- Recipients receive instructions to log in to the secure web portal, where they can retrieve the message, download attachments, and reply securely. · mimecast.com, 7 Oct 2026
- Secure delivery
- portal · mimecast.com, 20 Sept 2026
- Sender controls
- Before sending, users can choose options including read receipts, message expiration dates, and restrictions on printing and replying. · mimecast.com, 7 Oct 2026
- Software requirements
- Mimecast says senders and recipients do not need additional software downloads or hardware to use Secure Messaging. · mimecast.com, 7 Oct 2026
- Support
- Mimecast directs customers to its knowledge base, community, or technical support case system for assistance. · mimecast.com, 7 Oct 2026
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