Mailock® Pro

Keep client email

exchanges safe

Secure email for business freedom

Encrypt confidential business email exchanges and protect clients from fraud with end-to-end encrypted email.

Man reading an encrypted email on a laptop

Send workflow

How it works

1. Encrypt

Start a secure email from your desktop email client or your web browser. 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


Make sure the right

person is reading

Set read challenges for recipients

  • 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.
Woman reading secure message on her smart phone in kitchen

Recipient security

Share the power

to email securely

Pass your recipients a send or few

It’s not enough to protect information one way only. Make it easy for clients to reply securely, plus we'll give them some free send credits in case they need to deliver sensitive information to others.

couple receiving encrypted email and replying securely

Trigger words

Prevent data loss

with custom alerts

Don't let sensitive data escape

We're only human - sometimes we forget to think twice before hitting 'send'. Customise our preset trigger words. If they’re present in an unsecured email, Mailock will remind you to send it securely.

Prevent data loss with custom alerts


Regulatory guidance

A secure email service that helps you to comply with UK data security regulations


“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


I just think about
it as being email.

It hasn’t changed the way we work. Email is how most of our clients want to communicate and Mailock acts as a second pair of eyes.

 Sam Whybrow  Director, Thanks Wealth Planning
Professional man on phone and laptop in office


Secure your emails
without switching

Sign up to Mailock Pro to start securing messages and attachments using your existing email address and account.



Compose secure emails from Windows Outlook or our secure browser app. Write your message, add attachments, then set your challenge.


Your emails and attachments are secured with end-to-end AES-256 encryption - the NSA standard for classified information.



Verify untrusted contacts using a range of multi-factor authentication challenges including question-and-answer, SMS, and Unipass ID.



Every recipient interaction is recorded, including opens, downloads, and revoke calls. Read receipts help you to follow up at the right time.


Revoke secure emails sent in error, even if they've already been opened - your recipients will lose access to retrieve them immediately.


Recipients can read and reply to messages for free using our secure browser app. Grow your network by empowering clients to respond.


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.



Customise the recipient journey with your company branding to foster a familiar, trusted user experience for your clients and partners.

Download the Mailock
Pro Data Sheet

People in meeting around office table with laptops discussing potential savings from secure email

Increase efficiency

Save time spent sending sensitive information back and forth between colleagues, partners, and clients. Speed is key to a positive customer experience according to PWC reports.

Woman giving talk on sustainability in the office to professionals

Save paper

Let’s reach Net Zero together. Reduce your paper document output by taking your sensitive information exchanges digital. Save carbon and do it with bottom line impact.

Man with face in hands after sending email to the wrong person

Protect data

Free your business from open-risk email. Protect messages and files from cyber threat and human error. Exchange documents with customers in line with regulatory guidance.

man helping colleague to use secure email system

Free trial

Try Mailock Pro

Take advantage of unlimited secure email sends and all premium Pro features.

Case studies

  Hear from our users

2 min read
woman speaking to colleague in office
22 02 23

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.

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.