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SPECIFICTION
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Mimecast Secure Messaging

mimecast.com

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Spec score 7.7 #17 of 28 in File encryption tools

What it is

Mimecast Secure Messaging helps organizations protect sensitive information sent by email, including financial records and customer data. It sends protected messages through a secure web portal; Mimecast says the information stays in its cloud. Senders can set read receipts and expiry dates, and restrict printing or replies. Messages and attachments are scanned for viruses, checked against data leak prevention policies, and stored in an AES-encrypted archive. Recipients log in to retrieve messages, download attachments, and reply securely. Gateway policies can initiate the service, and administrator-defined criteria can trigger Office 365 encryption when TLS is unavailable. Senders and recipients need no additional software or hardware. The service supports Android, iOS, macOS, web, and Windows, and includes Outlook integration and administrative access controls. Pricing is on request. The Critical, Advanced, and Premium plans all include secure message and large-file delivery and email continuity; their listed security coverage varies by plan.

Spec sheet

Purpose
Secure Messaging helps organizations protect sensitive information sent by email, including financial records and customer data.Read 7 Oct 2026 · mimecast.com
Intended users
Mimecast describes the service as part of its business email subscription offering for organizations sharing sensitive information with colleagues and partners.Read 7 Oct 2026 · mimecast.com
Support
Mimecast directs customers to its knowledge base, community, or technical support case system for assistance.Read 7 Oct 2026 · mimecast.com
Headquarters
London, United KingdomRead 28 Sep 2026 · mimecast.com
Founded
2003Read 28 Sep 2026 · mimecast.com
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.Read 7 Oct 2026 · community.mimecast.com
Admin access controls
YesRead 20 Sep 2026 · mimecast.com
Cloud portal
Protected messages are sent and received through a secure email web portal, and Mimecast says the sensitive information never leaves its cloud.Read 7 Oct 2026 · mimecast.com
Message expiry
YesRead 20 Sep 2026 · mimecast.com
Message processing
Mimecast says messages and attachments are scanned for viruses, checked against data leak prevention policies, and stored in an AES-encrypted archive.Read 7 Oct 2026 · mimecast.com
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.Read 7 Oct 2026 · mimecast.com
Outlook integration
Users can compose a message in Outlook and select Send Secure in the Mimecast for Outlook tab.Read 7 Oct 2026 · mimecast.com
Policy automation
Secure Messaging can be initiated when an email matches policies applied at the email security gateway.Read 7 Oct 2026 · mimecast.com
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.Read 7 Oct 2026 · community.mimecast.com
Recipient access
Recipients receive instructions to log in to the secure web portal, where they can retrieve the message, download attachments, and reply securely.Read 7 Oct 2026 · mimecast.com
Secure delivery
portalRead 20 Sep 2026 · mimecast.com
Sender controls
Before sending, users can choose options including read receipts, message expiration dates, and restrictions on printing and replying.Read 7 Oct 2026 · mimecast.com
Software requirements
Mimecast says senders and recipients do not need additional software downloads or hardware to use Secure Messaging.Read 7 Oct 2026 · mimecast.com

Plans and prices

Advanced Price not published Securely send messages and large files · Email security with data protection · Email continuity Read 20 Sep 2026 · mimecast.com
Premium Price not published Securely send messages and large files · Comprehensive protection across collaboration tools · Email continuity Read 20 Sep 2026 · mimecast.com
Critical Priced on request Contact for pricing Securely send messages and large files (Cloud Gateway) Read 7 Oct 2026 · mimecast.com

Every Mimecast Secure Messaging plan and price →

Strong points and limits

Strong points

  • Portal access for recipients to retrieve and reply securely
  • Sender controls include expiry and print restrictions
  • Messages and attachments are scanned and archived encrypted
  • Supports Android, iOS, macOS, web, and Windows

Limits

  • Pricing is available only on request
  • End User Portal is included only in qualifying service packages

Who it suits

It suits organizations that need to share sensitive information with colleagues and partners by email. Its portal workflow and policy-triggered encryption are relevant to teams managing controlled access to messages.

Verdict

Mimecast Secure Messaging combines portal delivery with sender controls, message scanning, and policy-triggered encryption. Organizations should confirm pricing and whether their service package includes the End User Portal.

Where Specifiction places it

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