Mimecast Secure Messaging
Mimecast Secure Messaging helps organizations protect sensitive information sent by email, including financial records and customer data.
What Mimecast Secure Messaging is
Mimecast Secure Messaging helps organizations protect sensitive information sent by email, including financial records and customer data. Protected messages are delivered through a secure web portal, and Mimecast says the information stays within its cloud. Before sending, users can set read receipts and expiration dates or restrict printing and replies. Messages and attachments are scanned for viruses, checked against data leak prevention policies, and stored in an AES-encrypted archive. Recipients follow instructions to sign in to the portal, retrieve messages, download attachments, and reply securely. Email security gateway policies can initiate the service. Mimecast also says it can protect Office 365 email when TLS is unavailable and trigger encryption based on administrator-defined criteria such as recipient, domain, or subject keywords. Senders and recipients need no additional software downloads or hardware. The service supports Android, iOS, macOS, web, and Windows. Pricing is available on request. Portal beta access is limited to customers with Mimecast end-user applications, and the portal is included only in service packages that already include those applications.
Good
- Senders can set expiry dates and read receipts.
- Messages and attachments undergo virus and policy checks.
- Recipients can retrieve and reply through a secure portal.
- No additional software or hardware is required.
Watch out
- Pricing is available on request.
- Portal beta is limited to eligible customers.
- Portal inclusion depends on the service package.
Who it suits
It suits organizations that need to send sensitive information to colleagues or partners with portal-based access and sender controls. Organizations should note the stated End User Portal access and package limits.
Verdict
Mimecast Secure Messaging combines controlled portal delivery with message scanning, archiving, and sender-set restrictions. Access to the End User Portal depends on customer eligibility and the service package.
Plans and prices
From Mimecast Secure Messaging's own pricing page, checked 20 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Advanced | — | Securely send messages and large files · Email security with data protection · Email continuity |
| Premium | — | Securely send messages and large files · Comprehensive protection across collaboration tools · Email continuity |
| Critical | Priced on request | Securely send messages and large files (Cloud Gateway) · Contact for pricing |
The facts
Each one read from Mimecast Secure Messaging's own pages, with the date it was checked.
What it does
- 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.checked 7 Oct 2026
- Admin access controls
- Yeschecked 20 Sep 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.checked 7 Oct 2026
- Intended users
- Mimecast describes the service as part of its business email subscription offering for organizations sharing sensitive information with colleagues and partners.checked 7 Oct 2026
- Message expiry
- Yeschecked 20 Sep 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.checked 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.checked 7 Oct 2026
- Outlook integration
- Users can compose a message in Outlook and select Send Secure in the Mimecast for Outlook tab.checked 7 Oct 2026
- Policy automation
- Secure Messaging can be initiated when an email matches policies applied at the email security gateway.checked 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.checked 7 Oct 2026
- Purpose
- Secure Messaging helps organizations protect sensitive information sent by email, including financial records and customer data.checked 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.checked 7 Oct 2026
- Secure delivery
- portalchecked 20 Sep 2026
- Sender controls
- Before sending, users can choose options including read receipts, message expiration dates, and restrictions on printing and replying.checked 7 Oct 2026
- Software requirements
- Mimecast says senders and recipients do not need additional software downloads or hardware to use Secure Messaging.checked 7 Oct 2026
- Support
- Mimecast directs customers to its knowledge base, community, or technical support case system for assistance.checked 7 Oct 2026
The company
- Founded
- 2003checked 28 Sep 2026
- Headquarters
- London, United Kingdomchecked 28 Sep 2026
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