GITNUXSOFTWARE REVIEW
Cybersecurity & Information SecurityTop 10 Best Email Encrypting Software of 2026
Compare email encrypting software options for teams, including Virtru, Mimecast, and Paubox, with tradeoffs for compliance and secure delivery.
How we ranked these tools
Vendors set the topic, but our editors set the inclusion criteria and the evaluation framework before research starts.
AI search agents find sources, extract figures with provenance, and aggregate written reviews. They also transcribe video reviews and podcasts.
Framework: Features 40% · Ease 30% · Value 30%
Gitnux may earn a commission through links on this page. This does not influence our reviews. Editorial policy
Virtru is the best choice for enterprise teams that need consistent, policy-driven protection of email because its client-side encryption ties enforcement to the message and gives governance visibility, whereas Paubox fits centralized outbound encryption needs when you want a managed recipient decryption experience without a portal.
Editor’s top 3 picks
Three quick recommendations before you dive into the full comparison below — each one leads on a different dimension.
Virtru
Client-side encryption with a secure envelope recipient experience ties policy enforcement to message content.
Best for: Fits when email content needs consistent policy encryption with governance visibility for enterprise teams.
Mimecast
Editor pickGranular message-level auditing shows what encryption policy applied, what the recipient received, and why outcomes occurred.
Best for: Fits when security and compliance teams need policy-governed encryption with strong auditability for outbound email.
Paubox
Editor pickRecipient decryption is handled through Paubox’s managed experience using password-protected delivery and controlled access.
Best for: Fits when teams need centralized outbound encryption with an operational recipient decryption flow.
Comparison Table
Virtru
enterpriseData encryption and digital privacy platform for email and files.
Client-side encryption with a secure envelope recipient experience ties policy enforcement to message content.
Virtru’s core approach encrypts message content before it leaves the client workflow, then packages the result so the recipient can decrypt through a supported path. Encryption and decryption behavior can be driven by policy, which supports consistent handling for sensitive categories and reduces reliance on manual recipient coordination. Administration includes controls for access and auditing so governance teams can review protected message activity and key-related operations.
A key tradeoff is that client-side encryption can shift complexity toward client deployment, browser support, and user messaging for recipients who must use a portal or supported decrypt method. Virtru fits best when organizations need policy-based encryption for outbound email that extends beyond TLS-only delivery, and when they want repeatable enforcement through API-driven workflows.
- +Client-side encryption keeps message content protected before outbound transmission
- +Policy-driven encryption reduces per-email manual handling for senders
- +API and automation support helps enforce encryption in mail workflows
- +Enterprise admin auditing supports governance reviews of encrypted message activity
- –Recipient decrypt experience depends on supported portal or decrypt flow
- –Client-side deployment adds endpoint requirements versus gateway-only encryption
Legal operations teams
Encrypt privileged matter in outbound email
Fewer handling errors
Security engineering teams
Automate encryption enforcement via API
Repeatable controls
Show 2 more scenarios
IT governance teams
Review audit trails for encrypted mail
Better accountability
Administration surfaces protected message and key-related activity for compliance reviews.
Sales operations teams
Protect proposals sent to external parties
Reduced sender friction
Secure envelopes support outbound encryption without requiring senders to manage cryptographic steps.
Best for: Fits when email content needs consistent policy encryption with governance visibility for enterprise teams.
Mimecast
enterpriseCloud email security platform with encryption capabilities.
Granular message-level auditing shows what encryption policy applied, what the recipient received, and why outcomes occurred.
Mimecast targets teams that need encryption governance tied to broader email threat management, including controlled outbound mail flow rules and visibility into message outcomes. Encryption policy configuration is designed to pair with existing administrative processes such as message archiving, compliance retention, and audit-friendly reporting. For integration depth, Mimecast provides API access for configuration and operational data needed by security automation and workflow tooling.
A tradeoff appears in the operational model, where encryption decisions are governed by gateway-side policy rather than being purely user-controlled at compose time. Mimecast fits best for organizations standardizing encryption for high-volume outbound streams like vendor communications and HR notifications, where consistent recipient access and predictable tracking matter more than ad hoc user actions.
- +Policy-driven encryption tied to governed outbound mail flow
- +Recipient access and delivery tracking reduce encryption failure loops
- +Admin RBAC and audit logging for encryption and delivery actions
- +API access supports security automation and configuration workflows
- –Encryption control is gateway-centric, which can limit user-level flexibility
- –Operational setup requires careful rule coverage to avoid over-encryption
- –Advanced governance workflows need integration time with existing security tooling
- –Debugging encrypted delivery issues depends on message logs and event trails
Security operations teams
Automate encryption rules from SOC events
Faster containment of risky messages
Compliance and governance teams
Prove encryption policy enforcement
Clear evidence for audits
Show 2 more scenarios
IT administrators
Centralize encryption across domains
Consistent encryption at scale
Admins enforce outbound encryption behavior with header-based and workflow-aligned mail routing rules.
HR and finance operations
Standardize sensitive employee communications
Fewer misrouted sensitive emails
Outbound workflows encrypt routine documents for recipients using consistent delivery and access patterns.
Best for: Fits when security and compliance teams need policy-governed encryption with strong auditability for outbound email.
Paubox
vertical specialistHIPAA-compliant email encryption with no portal required.
Recipient decryption is handled through Paubox’s managed experience using password-protected delivery and controlled access.
Paubox focuses on adding encrypted delivery and recipient decryption into organizations that already run email workflows. It routes outbound messages through an encryption gateway and uses a recipient experience that supports password-based decryption for protected mail.
Administration centers on domain-wide controls, message policies, and logging to support audit and operations. The key differentiation is how Paubox blends gateway behavior with managed end-user access rather than making each sender handle encryption manually.
- +Outbound gateway encryption reduces sender friction and keeps enforcement centralized
- +Recipient password flow supports protected delivery when public-key exchange is impractical
- +Admin policy controls apply encryption rules across domains and outbound paths
- +Audit-friendly logs support incident review and compliance reporting needs
- –Password-based recipient decryption can add friction for high-volume external recipients
- –Advanced integrations require API and tooling work to match deeper governance needs
- –Granular S/MIME or PGP interoperability depends on how external recipients are set up
- –Policy tuning can be tricky when mixed sensitivity traffic shares the same send paths
Compliance and email administrators
Audit delivery and encryption events
Greater visibility into message outcomes
Regulated email operations teams
Apply protection for inbound and outbound
Uniform two-way sensitive email controls
Show 2 more scenarios
Healthcare administrative teams
Coordinate secure external clinic messaging
Consistent cross-organization secure channel
Organizations use protected email workflows to communicate with clinics, payers, and other outside parties.
Healthcare staff and care teams
Send patient info via managed secure mail
More controlled exchange of PHI
Staff exchange patient-related information using managed secure email instead of leaving it in unprotected threads.
Best for: Fits when teams need centralized outbound encryption with an operational recipient decryption flow.
Posteo
SMBAnonymous and secure email provider based in Germany.
User-driven PGP key workflow is the core design, with no enterprise gateway orchestration layer.
Posteo is an email provider that offers built-in encryption using PGP for message protection. Encryption happens on the client side through the recipient’s public key, with clear key-based delivery behavior for each recipient.
- +Client-side PGP encryption avoids deploying an SMTP gateway
- +Key-based recipient behavior is predictable per PGP public key
- +Works with existing email workflows without message-format gateways
- +Minimal admin surface for simpler end-user encryption operations
- –No organization-wide policy engine for forced routing or TLS enforcement
- –No documented API surface for automation, provisioning, or key lifecycle
- –Recipient access depends on correct key management by participants
- –Limited governance controls such as RBAC and audit logging for encryption
Small businesses and informal teams
Run encrypted routine team communication
Hosted email with restrained management
People with encrypted communication needs
Exchange OpenPGP-protected messages
Encrypted exchange without a gateway
Show 2 more scenarios
People using desktop or mobile clients
Connect via IMAP and SMTP
Familiar client access with encryption
Users connect mail clients through IMAP and SMTP while still sending encrypted messages using public keys.
Privacy-conscious individuals
Keep a simple private inbox
Simple private email for daily use
Individuals use a focused personal mailbox for daily sending and receiving while keeping messages protected with PGP.
Best for: Fits when teams need PGP-based confidentiality for user accounts without gateway policy automation.
LuxSci
enterpriseSecure email and messaging platform for regulated industries.
Recipient-secure access and decryption flow tied to encryption delivery decisions, reducing manual key handling.
LuxSci encrypts outbound email through policy-controlled gateway and client workflows that protect message content and attachments. It integrates with enterprise mail environments to enforce encryption on selected recipients and routes, then delivers access using secure delivery and recipient decryption flows.
- +Policy-driven encryption routing for outbound mail based on enterprise criteria
- +Recipient access flow reduces friction versus manual key exchange
- +Attachment protection supports common secure-document workflows
- +Operational visibility into encryption outcomes supports troubleshooting
- –Encryption policy setup can require careful mail-flow scoping and testing
- –Advanced interoperability depends on recipient client and configuration alignment
- –Operational workflows can be heavier than TLS-only deployments
- –Integration depth varies by mail architecture and connector coverage
Healthcare providers and operations teams
Protect outbound clinical email
More controlled handling of clinical messages
IT teams managing business email
Outsource mailbox with controlled mail flow
Predictable mailbox administration
Show 2 more scenarios
Email administrators and security operations
Govern encryption behavior across domains
More consistent outbound and inbound control
Administrators configure sender identity, routing, authentication, retention, and encryption behavior across business domains.
Teams messaging external recipients
Send protected messages to outside parties
Protected delivery without manual key management
Teams send protected messages to patients, partners, or external professionals through a recipient-facing secure access flow.
Best for: Fits when teams need configurable encryption beyond opportunistic TLS with consistent recipient handling.
PreVeil
SMBEnd-to-end encryption for email and files with key splitting.
Encrypted message handling paired with recipient access workflows managed from policy.
PreVeil focuses on client-side email encryption with policy-driven handling for outbound messages and user-controlled access workflows. The product supports secure delivery using encrypted content plus recipient options for obtaining a readable view without exposing plaintext to mail servers.
- +Client-side encryption keeps plaintext out of the outbound mail stream
- +Policy controls support consistent handling across users and mail flows
- +Recipient access workflows reduce friction versus manual key exchange
- +Administration and reporting provide governance visibility for encrypted mail
- –Admin setup requires careful policy mapping to real user behaviors
- –Advanced gateway-style enforcement for inbound mail is not the core focus
- –API extensibility is narrower than suites built around mail gateway integrations
- –Operational overhead increases when supporting varied recipient access methods
Security, legal, and business teams
Protect external recipient communications
Governed protected workflow delivery
Organizations handling sensitive attachments
Encrypt attachments in outgoing mail
Reduced attachment exposure
Show 2 more scenarios
Distributed workforces and teams
Access encrypted content on multiple devices
Protected access beyond one desktop
Users access encrypted email and files through mobile and desktop applications for protected communications.
Government agencies and public-sector teams
Apply policy-controlled encryption across boundaries
Clear ownership and revocation controls
Agencies apply policy-controlled encryption with recipient-aware access governance across organizational boundaries.
Best for: Fits when teams need end-user-first encryption with centralized policy control.
CipherMail
enterpriseEmail encryption software supports gateway deployment, S/MIME, PGP, and secure delivery workflows.
Gateway policy engine that ties encryption enforcement to mail flow rules and attachment handling, not just message-level toggles.
CipherMail routes outbound email through an email-encryption gateway and applies policy to protect message content and attachments. It supports both standard encrypted delivery flows and recipient access options that avoid exposing readable content to intermediate servers.
- +Policy-driven gateway routing for outbound messages and attachments
- +Recipient access experience designed for non-client recipients
- +Clear separation between encryption enforcement and key access handling
- +Operational logs for tracking encryption decisions and delivery outcomes
- –API surface for encryption automation is limited versus API-first vendors
- –Setup requires careful alignment of mail routing rules and policies
Legal teams handling confidential matters
Encrypting attachments in partner email exchanges
Confidential documents stay protected
Healthcare providers sharing sensitive PHI
Securing referrals and discharge communications
Reduced exposure across mail hops
Show 2 more scenarios
Financial teams sending compliance documents
Encrypting statements and audit evidence
Audit-ready message protection
CipherMail applies encryption behavior to specific mail paths to safeguard sensitive financial materials.
Enterprise IT mail administrators
Defining encryption rules for departments
Consistent policy enforcement
CipherMail administration supports encryption configuration for user groups and mail paths without application-level integration.
Best for: Fits when teams need gateway-enforced outbound encryption with governance over which messages get protected.
Trustifi Email Encryption
enterpriseCloud email encryption applies policy controls, recipient portals, and outbound message protection.
Recipient access through a portal-style decryption flow tied to encrypted message delivery.
Trustifi Email Encryption is an email encryption and recipient access workflow built around a secure envelope delivery model for outbound messages. It supports PGP-compatible encryption and policy-driven encryption so outbound mail flow rules can determine when messages are protected.
- +Policy-based outbound encryption rules reduce manual handling errors
- +PGP-compatible encryption supports interoperability with common security stacks
- +Recipient access flow reduces friction versus basic password-only sharing
- +Clear encryption coverage for outbound mail contexts
- –Limited evidence of deep RBAC, granular admin roles, and workflow delegation
- –Less emphasis on gateway-to-gateway automation and audit log export
- –Encryption success handling and failure fallback policies appear narrow
- –Integration depth around DLP-triggered encryption and API automation is not prominent
Healthcare privacy operations teams
Send protected test results to external providers
Reduced disclosure risk
Legal and compliance teams
Share confidential filings with opposing counsel
Confidentiality maintained
Show 2 more scenarios
IT administrators and helpdesk
Provision encrypted mail access for employees
Faster access provisioning
Admin setup focuses on user provisioning and routing rules for protected outbound delivery.
Customer support operations
Transmit account changes requiring protection
Safer customer communication
Policy-driven encryption protects outbound communications without relying on endpoint certificate handling.
Best for: Fits when teams need controlled outbound encryption with predictable recipient access and basic admin governance.
Citrix ShareFile
enterpriseSecure file sharing with email encryption capabilities.
Secure links delivered through ShareFile workspaces enforce access rules at retrieval time.
Citrix ShareFile combines secure file sharing with email delivery protections, so message confidentiality depends on how outbound links and attachments are governed. It supports client-side encryption and a recipient portal experience that keeps content protected after delivery.
- +Recipient portal retrieval avoids forwarding attachments with no access revocation
- +Client-side encryption supports encrypted content before it leaves the endpoint
- +Granular workspace permissions map encryption access to RBAC-style access control
- +Audit trails connect secure sharing events to identities and timestamps
- –Encryption coverage for message bodies is limited versus gateway-only email encryption
- –Outbound email flow depends on ShareFile link delivery patterns and user behavior
- –Automation is less complete than dedicated mail gateways with rulesets
- –Key management and HSM options are not the primary focus compared with PGP-centric tools
Teams handling confidential documents
Send files via restricted links
Recipient access governed after distribution
Professional services client-facing teams
Collect documents through client portals
Controlled intake with consistent access
Show 2 more scenarios
Operations and compliance teams
Request external uploads with rules
Files stored under defined sharing rules
Internal administrators manage browser-based workflows that request uploads from external contributors.
Government and healthcare collaboration teams
Collaborate with guests and partners securely
Clear permissions and activity visibility
Organizations provide controlled workspaces for internal teams, guests, and partners exchanging sensitive documents.
Best for: Fits when teams need encrypted sharing via governed links and portal access, not full mail-body end-to-end encryption.
Barracuda Email Encryption Service
enterpriseCloud email encryption service integrated with Microsoft 365 and Barracuda email security tools.
Policy-driven encryption enforcement tied to Barracuda mail flow routing decisions.
Barracuda Email Encryption Service fits organizations that need policy-based control of message protection in outbound mail flows without relying only on recipient-side behavior. It provides a gateway-oriented encryption workflow that can wrap messages for protected delivery and can be paired with Barracuda’s administration and logging controls for governance.
- +Gateway-based encryption enforcement for outbound traffic
- +Administration alignment with Barracuda email security controls
- +Governance-oriented audit trails for protected message activity
- +Works well with policy-based routing in mail flow
- –Encryption behavior depends on correct mail flow placement
- –Recipient experience can vary with delivery and decryption methods
- –Automation via API is less central than policy and gateway controls
- –Operational overhead increases with complex exception handling
IT security teams
Enforce encryption on outbound sensitive mail
More consistent encryption coverage
Email security operations
Govern exceptions and enforcement
Fewer enforcement surprises
Show 2 more scenarios
Compliance and audit owners
Track protected message activity
Stronger audit traceability
Compliance teams rely on audit records tied to protected message handling to support internal review and response.
Enterprise IT
Standardize encryption across users
Reduced user-level inconsistency
Enterprise IT applies organization-wide policy so users do not need to self-manage encryption choices.
Best for: Fits when teams need gateway-enforced encryption governed by outbound mail flow policies.
Conclusion
After evaluating 10 email encrypting software, Virtru stands out as our overall top pick — it scored highest across our combined criteria of features, ease of use, and value, which is why it sits at #1 in the rankings above.
Use the comparison table and detailed reviews above to validate the fit against your own requirements before committing to a tool.
Frequently Asked Questions About Email Encrypting Software
How does Virtru handle encryption at the client versus the gateway?
When should Mimecast be chosen over Virtru for audit requirements around encrypted delivery?
Which tool supports API-driven automation for encryption policy enforcement across mail flows?
What breaks if TLS enforcement fails for outbound messages that rely on gateway encryption?
How do Proofpoint-style gateway suites differ from PreVeil’s client-first workflow?
When is a portal-style decryption experience a better fit than certificate-based handling?
Which vendors provide stronger admin governance via RBAC and audit logs for encrypted delivery actions?
How should teams migrate existing encryption policy to a new system without breaking recipient access?
What tradeoff appears when choosing ShareFile for email confidentiality instead of end-to-end email encryption?
How does Trustifi handle recipient access when different recipients need different decryption outcomes?
Tools reviewed
Primary sources checked during evaluation.
Referenced in the comparison table and product reviews above.
How to Choose the Right Email Encrypting Software
Options for email encrypting software differ most in how they handle keys, how messages are transformed on the way out, and how admins verify delivery and compliance outcomes. In practice, choices often come down to the fit between integration depth and the controls behind authentication, audit log coverage, and recipient experience.
Key handling for known recipients
Why it matters
Key handling for known recipients determines whether encryption stays predictable during everyday sending and how often users hit exceptions. This affects throughput of normal mail flow and the quality of the final encrypted result.
How to check
Ask for a walkthrough of recipient onboarding: how the system learns recipients and what happens when a recipient is unknown. Then try a test send to an address that is present and one that is not, and record whether you get an encryption failure or an alternate behavior.
Typical range
Most mature products support multiple recipient provisioning patterns and clear failure behavior, not silent skips.
Outbound transformation and failure behavior
Why it matters
Outbound transformation and failure behavior matters because encryption is only useful when the mail either encrypts correctly or fails transparently. Buyers need to know what changes in headers, the email body, and how users are notified when encryption cannot be applied.
How to check
In a demo, send a message that should encrypt and inspect the received output fields (subject/body formatting indicators and any message wrapper). Then attempt a forced failure scenario (for an unrecognized recipient) and confirm what the sender sees and what the recipient receives.
Admin permissions and RBAC scope
Why it matters
Admin permissions and RBAC scope control who can manage recipients, encryption settings, and delivery policies. That directly affects governance and auditability when multiple teams operate the environment.
How to check
Request a sample admin role setup: at minimum, show what a read-only admin can view and what a policy admin can change. In the UI, try actions as two different roles and confirm the access boundaries are enforceable, not cosmetic.
Typical range
Effective products usually support multiple roles with distinct permissions for configuration, recipient management, and reporting.
Audit logs for encryption outcomes
Why it matters
Audit logs for encryption outcomes are how teams prove what happened to outbound messages. Without clear records, incident review and internal verification become guesswork.
How to check
Ask how the product records events per message: success, failure reason, and the acting admin or integration trigger. Then export a report for a small set of test emails and verify the log fields are consistent and searchable.
Automation workflow and API-based provisioning
Why it matters
Automation workflow and API-based provisioning reduce manual recipient setup and prevent drift across teams. This is the main lever for maintaining consistent encryption behavior at higher operational tempo.
How to check
Ask for an API or automation workflow demo for provisioning recipients/groups and for triggering test sends. Then review example payloads and confirm the system supports dry-run or test modes without changing production settings.
Typical range
Look for documented endpoints and repeatable workflows rather than one-off scripts.
Red flags
- Encryption fails without a clear sender-visible reason
- Role access changes the UI but not the underlying permissions
- Audit logs don’t connect outcomes to specific messages
Fit by situation
- If your team needs to onboard recipients frequently and consistently, prioritize Key handling for known recipients.
- If you must explain what happened to a message during an incident, prioritize Audit logs for encryption outcomes.
- If multiple admins manage settings and reports, prioritize Admin permissions and RBAC scope.
Funding and competing interests
This study was co-funded by several of the vendors assessed in it. No single vendor funded it. Funders could propose the market studied.
They had no role in selecting vendors, setting or weighting criteria, analysing data or drawing conclusions, and they received the same factual-accuracy check as every other vendor assessed.
Market definition, inclusion rules and criteria weights were fixed by an editor before research began and did not change afterwards. Editorial process →
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