Mailock® For Outlook

Secure your

Outlook emails

The email encryption Outlook add-in

Encrypt Outlook emails and set recipient authentication challenges with our email encryption add-in for Windows.

Male professional sending secure emails to his clients on laptop using mailock

Outlook secure send

How it works

1. Encrypt

Click the ‘Secure Email’ button in the Mailock Outlook add-in, compose your message, and hit ‘send’. Set a challenge so only the right people gain access.

Mailock secure email button on the Outlook ribbon using add-in

2. Connect

Recipients click ‘Open’ on the notification delivered to their inbox. They’ll answer your challenge, or if they're trusted, they can read right away.

Enter the code to unlock your secure email in the Mailock Outlook add-in

3. Engage

If recipients need to respond to a secure message, they can use Mailock to compose, attach, and reply using their existing email address and account.

Secure read pane in Mailock web app after receiving a secure email in Outlook
Mailock secure email button on the Outlook ribbon using add-in
Enter the code to unlock your secure email in the Mailock Outlook add-in
Secure read pane in Mailock web app after receiving a secure email in Outlook

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'. Set authentication challenges for outbound emails in Outlook.

  • 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.
Email recipient authentication challenges on smartphone for message sent in Outlook

Trigger words

Stop email mistakes

before it's too late

Get sensitive data alerts

Customise a preset list of words that trigger ‘sensitive data’ alerts. Encrypt an Outlook message before it sends with a single click. Just install the secure email add-in.

Trigger word warning in Outlook using the Mailock add-in

Message revoke

Revoke you

can rely on

Lock down emails sent in error

Outlook's native email recall works in a limited few scenarios. Mailock gives you the power to revoke secure messages unilaterally to contain a data breach.

Professional male in office using the Mailock Outlook add-in revoke function

Outlook email compliance

Fulfil your obligations

Encrypt personal information (GDPR)

The Information Commissioner's Office (ICO) and Financial Conduct Authority (FCA) require businesses to encrypt sensitive data transferred digitally. The ICO can levy fines of up to £17m for non-compliance (or 4% of turnover).

Record proof-of-delivery (MIFID II)

All businesses should record digital communications and retain proof-of-delivery to align with ICO guidance. Proof-of-receipt is also required by the FCA for certain types of document (e.g., KIDs).

Protect customers (Consumer Duty)

Are you encouraging customers to send their information into your business unsecured? The FCA's Consumer Duty is a mandate to provide easy-to-understand communications and protect customers from financial harm.


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 Outlook email encryption usage and savings


The best Outlook add-in for email risk

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

Email icon


Send secure emails from Windows Outlook. Click the Mailock icon to compose an encrypted email and set your recipient authentication.
Encryption icon


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

Message read icon


Select from a range of authentication methods. Set SMS or question-and-answer challenges to make sure the right people gain access.

Lightbulb icon


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.
Stars icon


Recipients reply securely for free. They'll also get some free sends. Empower clients with an encrypted thread to your business.
Magnifying glass


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


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


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 at office desk recalling an email in outlook successfully

Blog post

How To Recall An Email In Outlook

Sending an email in error is easy, but recalling it in Outlook can be tricky.

Case studies

  Hear from our users

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