Mailock® Email Encryption

Secure email,
made to connect

Discover your fully compliant end-to-end encrypted, auditable customer email thread. Exchange confidential messages and documents easily and securely.

Business people securing emails with encryption

How it works

Zero compromise

What is Mailock?

How it works

1. Encrypt

Initiate encryption from within your email client, using company-wide rules, or route your digital document output through the Mailock network.


2. Connect

Recipients click ‘Open’ on the digital envelope delivered to their inbox to start the Mailock in-browser app. You can set challenges to verify their identity, or allow them to decrypt and read right away.


3. Engage

Our browser app works just like an email client. Recipients download files, compose, attach, and reply. When you receive their replies and attachments, they are automatically decrypted into your inbox.


Why secure email?

How Mailock helps your business

Crowd cheering with success
Customer focus icon

Communicate efficiently

“Can’t you just email it to me?!' Exchange sensitive documents easily, instantly, with peace-of-mind that data is safely shared.
Prevent interception

Prevent interception

Protect customers from email interception and fraud with NSA-grade security. Encrypt off-site data for FCA and ICO compliance.

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Minimise paper output

Save carbon and save costs by minimising your paper output. Meet your ESG targets and do it with bottom-line impact.

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Reduce human risk

Emails sent to the wrong person are the #1 cause of data exposure. Decrease risk with 2-factor authentication and Full Revoke.


It's email as you
know it, encrypted

Free your data from open-risk email, with AES-256 encryption and 2-factor authentication.

Compose icon


Compose emails and attach files from within your email client or our web app. Or, plug in your automated document output to encrypt in bulk.

Challenge icon


Set 2-factor authentication challenges so only the right people can open your emails (select from SMS and Q&A).

Encrypt icon


Deliver emails and attachments with end-to-end AES-256 encryption - the NSA standard for classified data.

Trace icon


Record a full audit trail of all message activity. Get read alerts when emails are opened so you can follow up.

Revoke icon


Sent to the wrong person? Remove access to emails anytime, even if they've been opened - with Full Revoke.

Engage icon


Recipients attach and encrypt free. Empower customers with an encrypted email thread to your business.



Mailock integrates with any email provider, working alongside your existing CRM, antivirus, and data loss prevention (DLP) software.

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Deliver confidential documents to your customers at scale, with fully automated digital recorded delivery®.


"From a governance, data security and ease of use point of view what we gain is significant,

and allows us to demonstrate to our advisers/customers that we take protecting their data seriously, at the same time as offering them an industry platform on which to use/receive and send free of charge."

 John McGlynn  Royal London
Financial services leader

Pricing plans

Simple, scalable plans



For light users

per user, per month (+VAT)
5 secure emails per month
30-day message lifetime
Q&A authentication


For 50+ user businesses

From £3.50
per user, per month (+VAT)
Unlimited secure emails*
365-day+ message lifetime
Q&A authentication
SMS authentication
Full message revoke
Custom trigger words
Promote your brand
Third-party authentication**
API control & monitoring
Automated bulk delivery

Learn more

How will you use Mailock?



Secure client comms

Protect email exchanges from cyber threat and human error with our email encryption add-in for Outlook. Encrypt, authenticate, and revoke with Mailock.

Customer services in office


Data loss prevention

Secure messages and documents between company and customer. Get full BI/MI analytics. Encrypt, engage, and gain intelligence with Mailock.

IT team member looking at computer with email encryption-1


Bulk output encryption

Deliver confidential documents to your customers at scale, with fully automated AES-256 bulk email and attachment encryption. Encrypt, automate, and audit with Mailock.

Case Studies

 Customer stories

2 min read
Business man at desk smiling and looking at the camera
Case Study
03 11 21

How The Right Mortgage Keeps Email Data Safe With Mailock

The Right Mortgage’s forward-thinking approach to data protection using Mailock email encryption frees them from communications risk.

3 min read
Fair Deal Mortgages Case Study Mailock
Case Study
30 11 21

How Fair Deal Mortgages Prioritises Client Safety in the 'New Normal'

Learn out how Fair Deal Mortgages uses Mailock email encryption to protect their outgoing email communications and secure their data against cyberattack.

4 min read
colleagues high-five over successful business venture
Case Study
17 01 22

How Mailock Assists Harwell Finance Group with Email Compliance

Protecting your business from digital risk has never been more important. Find out how Harwell Finance Group secured their communications during the pandemic.

What is email encryption?

Email encryption is the encrypting, or disguising, of email content to protect it from being intercepted. It is a key piece of outbound email security. Encryption is often coupled with identity authentication in secure email software to make sure email contents can't be read by anyone other than the intended recipient.

Why is email not secure?

Email has been around as long as the internet has and it was never designed to be highly secure. When you send an email, just like with any other data on the internet, it travels through multiple nodes in a network. At any one of these points, a bad actor could be present. It could be at your mail server, the server of your recipient, or somewhere in the middle. If your email contents are not encrypted, they can be accessed, even manipulated, before reaching their destination.

Can I encrypt emails?

The most common email clients including Outlook, Gmail, and iOS provide a level of basic encryption on delivery. They all offer optional S/MIME encryption as standard, and a Microsoft 365 E3 licence gives users additional functionality in the form of 365 Message Encryption. The key difference between the S/MIME encryption standard and the encryption available with 365 Message Encryption is compatibility. Whereas the encryption offered as standard by providers requires the recipient's email client to be S/MIME compatible, 365 Message Encryption keeps emails secure when delivered to recipients using any email provider.

It's important to ensure the level of encryption that you use suits your business' and your customers' needs. One key element in this is the level to which you will need to exchange sensitive documents. Are you're sending documents to be filled in and returned? The optional encryption offered by most email clients (S/MIME) protects documents in transit on delivery. They will only be encrypted on the way from you to your recipient. On the way back, they'll be open to interception. Equally, if someone can gain access to your recipients' inbox, they will be able to download and access any sensitive attachments. 

What is secure email?

A layer of encryption is important, but it doesn't protect against the #1 cause of data leaks - human error. If you send a sensitive email to the wrong person, encryption won't protect you. Secure email solutions combine identity authentication with email encryption, so even if you send an email to the wrong address, the wrong person can't gain access. Authentication methods can include device checks, challenge questions, or third-party certificates. If sending sensitive data to the wrong person is a concern, choosing an email encryption solution with authentication capabilities is the answer.

What is Mailock?

Mailock is a secure email solution that enables the safe and compliant exchange of confidential data. It combines award-winning encryption technology with multi-factor identity authentication to protect confidential emails from cyber risk and keep customer information protected.

* Ts & Cs

  • All prices exclude VAT.
  • *Fair usage policy applies.

  • **We are continually developing 3rd party authentication integrations.

  • Data storage periods can be customised to meet enterprise plan needs.

  • Features deployed for enterprise plans may vary based on infrastructure, requirements, and the package negotiated with our team.

  • Existing Business Premium, Pro, or Lite licence holders, please contact support.