Mailock® For Outlook

Secure your

Outlook emails

Keep confidential exchanges safe

Encrypt your Outlook emails and set recipient authentication challenges with an easy-to-use add-in for Windows Outlook.

man sending secure emails to his clients using mailock

Outlook secure send

How it works

1. Encrypt

Start a secure email from Windows Outlook or use our browser app. Set a challenge so only the right people gain access.

Start a secure email with a button in your email client

2. Connect

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

Enter the code to unlock your secure email

3. Engage

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

Secure read pane in Mailock web app
Start a secure email with a button in your email client
Enter the code to unlock your secure email
Secure read pane in Mailock web app

Outbound security

Extend Outlook for

outbound security

Prevent interception and fraud

Protect confidential information with an email encryption Outlook add-in to cover you against outbound email risk.

  • Multi-factor authentication
  • 'Before you send' trigger alerts
  • Full message and attachment revoke

    (regardless of receiving email client)
Extend Outlook for outbound security


Check recipient

identity for access

Set authentication challenges

Ask your recipients to prove they 'are who they say they are' to gain access to secure emails you send them.

  • SMS: Send a one-time code to your recipient's mobile device.
  • Q&A: Ask your recipient a question only they could correctly answer.
  • Unipass ID: Allow financial professionals to verify their ID using Unipass.
Man receiving recipient authenticated email

Trigger words

Stop email mistakes

before it's too late

Get sensitive data alerts

Add custom trigger words so the inclusion of specific phrases nudges you to send an email securely. If Mailock thinks it sees sensitive data, it'll ask if you want to encrypt.

Trigger word alert-1

Message revoke

Revoke emails

in every case

Reliably revoke access

Microsoft email recall works in a limited few scenarios. Mailock gives you the power to revoke secure emails immediately and unilaterally to contain a data breach.

Man in office looking at laptop stressed about sending email to the wrong person (1)

Outlook email compliance

Fulfil your obligations


“Personal data shall be: processed in a manner that ensures appropriate security of the personal data, including protection against unauthorised or unlawful processing and against accidental loss, destruction or damage, using appropriate technical or organisational measures ('integrity and confidentiality').”
ICO, 2021

ISO 27001

“You should use encrypted communication channels when transmitting personal data. You should use encryption and ensure that your encryption solution meets current standards.”
— ICO, 2021


"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."
- FCA, 2017


"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.”
— FCA, 2021


We can send and receive our client information safely. That's important.

Mailock removes a lot of the risk and GDPR concern around dealing with everyone’s favourite communication method - email.

 Rob Hastings  Harwell Finance
Wealth planning meeting to discuss email encryption usage and savings (1)


The best Outlook add-in for email risk

Encrypt confidential emails and authenticate recipients with our secure email encryption add-in for Microsoft Windows Outlook.



Send secure emails from Windows Outlook. Click the Mailock icon to compose an encrypted email and set your multi-factor challenge.


Deliver emails and attachments with end-to-end encryption - the NSA standard for classified data. Don't leave your data open to risk.



Select from a range of authentication methods. Set email verification, SMS, and Q&A challenges to make sure the right people gain access.



Catch sensitive emails before it's too late, with custom trigger words. If they're included in a message, you'll be alerted to send it securely.


Recipients reply securely for free. They'll even get some send credits themselves. Empower clients with an encrypted thread to your business.


Record audit trails for every message interaction including opens, downloads, and revoke calls. Get read notifications so you can follow up.


Revoke secure emails anytime, even if they've been opened, regardless of whether your recipient is using Outlook, Gmail, or another provider.


Double-click any Outlook message that was secured with Mailock and it will automatically be decrypted to your inbox for easy access.

Download the Outlook
Add-In Data Sheet

Man reading secure email using his smartphone (1)

Mailock Pro

Free 14-day trial

Try Mailock Pro for free. Get unlimited secure email sends and download the Outlook add-in to use with full functionality.

Case studies

  Hear from our users

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Brearley Law Puts The Protection Of Client Data First With Mailock

According to the most recent ICO statistics, the UK legal industry is responsible for 8% of total data breach incidents reported in the past year.

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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.

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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.