Mailock® Enterprise

Protect critical

customer comms

Enterprise secure email gateway

Exchange confidential information using our advanced secure email gateway for friction-free customer comms.

Woman smiling in offer using laptop to secure emails next to colleagues (5)


Prevent the worst,

communicate better

Engage your customers safely

Mailock Enterprise enables secure communications for your organisation. Protect sensitive information with a seamlessly integrated secure email gateway.

  • Enable confidential communications
  • Comply with FCA/ICO/ESMA guidance
  • Create a branded recipient experience
SEG manager in office


Exchange securely

Advanced end-to-end encryption

Encrypt emails with end-to-end security. Advanced key management ensures Mailock messages are only ever accessible to ID-verified recipients.

Advanced end-to-end encryption
Threat vectors:

Human error

Our unique identity challenge processes ensure that sensitive misdirected emails remain encrypted; only identity verified recipients can open your encrypted messages.

Cyber threat

Messages and attachments are protected throughout their journey with military-grade AES-256 encryption ciphers.


Identify recipients

Prevent unauthorised access

Set identity challenges that recipients must pass to gain access. They'll receive a notification email to guide them through the process safely.

Receiving a Mailock secure email with ID verification

Challenge options:


Mailock challenges

Use Mailock's toolbox of user-selectable challenges, including question-and-answer, email verification, and SMS code.

Third-party integrations

Connect with third-party authentication applications such as Unipass to verify identity using industry-specific challenges.


Use the Mailock API to set SMS challenges using your Customer Relationship Management (CRM) platform data.


Drive engagement

Empower customers to securely reply

Recipients can read messages and download attachments without creating an account, and connect their email to reply for free.

Empower customers to securely reply

Proven adoption...



Boost efficiency

Auto-decryption for company inboxes

Any secure emails your business receives are decrypted at server level, so they can be routed to inboxes and easily replied to.

Auto-decryption for company inboxes

Our happy clients:

The recipient experience


1. Receive

Recipients receive a notification email to let them know they have a secure message waiting to be opened. This message can be customised with your company branding or use the familiar Mailock template.

Receiving a Mailock email

2. Identify

Recipients click ‘Open’ on the notification delivered to their inbox. They’ll answer any challenges that have been set, if they're trusted, they can open and read right away.

Securing a message with a text

3. Reply

If recipients need to reply to a secure message, they can use Mailock to compose, attach, and send using their existing email address and account. They'll even get a limited number of secure emails to send to other people if they need.

Secure compose using our web app
Receiving a Mailock email
Securing a message with a text
Secure compose using our web app


Respect your flow

Security that plays well with others

Mailock respects your mail flow, leaving emails accessible to data loss prevention and server-side signature tools within your infrastructure.

Security that plays well with others

Works with...

Microsoft 365 logo
Mimecast logo
Sophos logo
Symantec logo
Tessian logo
Salesforce logo


Guarantee email
data compliance

Protect data in line with regulatory guidance.


"Have a policy governing encrypted email, including guidelines that enable staff to understand when they should or should not use it. For example, there may be a guideline stating that any email containing sensitive personal data (either in the body or as an unencrypted attachment) should be sent encrypted."

"[in the event of a data breach] act quickly. Try to recall the email as soon as possible. If you can’t recall it, contact the person who received it and ask them to delete it. The 72 hours following a personal data breach are particularly critical."


"Keep a copy of relevant electronic communications, made with, sent from or received on equipment: (1) provided by the firm to an employee or contractor; or (2) the use of which by an employee or contractor has been sanctioned or permitted by the firm."


"Have sound security mechanisms in place to guarantee the security and authentication of the means of transfer of information, minimise the risk of data corruption and unauthorised access and to prevent information leakage maintaining the confidentiality of the data at all times.”


Comprehensive outbound security

Our secure email gateway gives you the tools to protect all your confidential email exchanges.


Email encryption

Secure sensitive emails and attachments by obscuring data with military strength AES-256 encryption.


M365 integration

Integrate Mailock with your 365 mail exchange alongside your CRM, antivirus, and server-side signature.


Recipient authentication

Authenticate recipients using multi-factor challenges including, SMS, question-and-answer, and Unipass ID.

Robust revocation

Messages can be revoked at user or admin level, immediately removing access to lock down a breach.


Error prevention

Prompt users to send a message securely if it includes certain types of information, with trigger words.

Flexible configuration

Configure how encryption is initiated for sensitive emails (e.g., Outlook add-in, keywords, rule-based, automated).

Secure audit trails

Timestamped audit trails track message opens, clicks, and downloads for proof-of-delivery and compliance.


Advanced interfacing

Tap into the Mailock API for revocation, audit trails, MI/BI analytics, batched and bulk automated encryption.

High-volume delivery

Deliver automated secure email at scale with no imposed ceiling on volume (package dependent).


Configure Mailock
for your needs

Simple set up and deployment

Managed-for-you or by-you

Provide your exchange details to use our managed service or deploy for yourself with our support.


On-cloud or on-premise

Deploy your appliance in the cloud or host it within your on-premise infrastructure.


Single or multi-tenancy

Run parallel instances of the appliance to enable secure email for multiple clients or brands.


EU or self-hosted storage

Host sensitive data in our EU storage location or on a dedicated server in another locale.


Manual-enabled or auto-only

Automatically encrypt messages containing subject line keywords and enable desktop user controls through our Windows Outlook-add-in.


White-label or branded

Provide a white-label service to your clients or customise our web app and notifications to create a branded recipient experience.

Download the Mailock
Enterprise Data Sheet

Gain intelligence

Monitor engagement

Leverage BI/MI analytics

Tap into the Mailock API for usage and engagement analytics. Surface key insights such as response times and attachment download rates.

Man sitting at computer at night impressed by secure email ease-of-use


Transform your
customer comms

Engage customers using a secure email solution that aligns with your key digital transformation goals.

Team doing plastic cleanup and bumping elbows

Save paper

Strengthen your environmental, social, and governance proposition. Businesses with strong ESG goals achieve higher equity returns and reductions in bottom-line risk.

budget meeting with financial controller explaining cost cutting initiatives copy (1)

Cut costs

Over 9.5 billion documents are sent in the UK each year, the vast majority by businesses. In the UK financial services industry alone, digitising print and post could save £1.3 bn.

Man anxious about having sent unsecured email

Protect data

Free your organisation from open-risk email. Protect messages and files from cyber threat and human error. Comply with ICO guidance on encrypting sensitive customer data.


It shows we take protecting customers' private data seriously,

with an industry standard platform they can use to send and receive free-of-charge.

 John McGlynn  Royal London
Business Team Looking at tablet and smiling

Maintain compliance

Prevent data loss

Use custom security profiling

Every company has a different profile for what is considered sensitive information. With Mailock, you can customise preset filters for the kinds of information that trigger the email encryption gateway to secure an email.

IT team looking at secure email on desktop computer
IT team looking at demo email security software (1)

Next steps

Watch a demo

See how Mailock Enterprise could secure your communications.

Case studies

  Hear from our users

2 min read
Securing Client Communications At Stonebridge Financial
21 12 22

Securing Client Communications At Stonebridge Financial

Find out how Stonebridge Financial secured their email communications using Mailock, driving efficiency and engagement with their clients in the process.

3 min read
Securing Client Communications At Thanks Wealth Planning
11 11 22

Securing Client Communications At Thanks Wealth Planning

Personal information is abundant within financial services. This case study shows how Thanks Wealth Planning increased security for their communications.

3 min read
How Mailock Secures Sensitive Emails At Genius Wealth Management
22 07 22

How Mailock Secures Sensitive Emails At Genius Wealth Management

How Mailock Secures Sensitive Emails at Genius Wealth Management. Did you know that 70% of financial firms in the UK experienced cyberattacks in 2020?