Mailock® Professional

Secure email for
risk-aware SMEs

Outbound security for client comms

Protect emails from unauthorised access and sender error, with integrated Outlook email encryption. Encrypt, authenticate, and revoke with Mailock.

Man reading an encrypted email on a laptop


Encrypt emails and attachments at the click of a button

Protect customer and client data with an email encryption add-in that plugs right into your Microsoft Outlook desktop app.



Send secure emails using Outlook desktop. Simply click the Mailock icon to compose an encrypted email and set an authentication method.
Message read


Select from multiple two-factor authentication options. Set Q&A or SMS code challenges to ensure only the right people open your emails.



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



View a full audit trail of every interaction with your message, including recipient opens, file downloads, and user recalls.



Recall emails anytime, even if they've been read - your recipients will lose access to retrieve them.


Recipients reply for free - empower clients with an encrypted email thread to your business.

How it works


1. Encrypt

Start an encrypted message with the click of a button in your email client, compose, and send. Get prompts to encrypt if Mailock thinks you might be sending sensitive information.


2. Connect

Recipients click ‘Open’ on the digital envelope delivered to their inbox to start the Mailock in-browser app. Set challenges to verify their identity - or, if they're a trusted contact, they can 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.



2-Factor Authentication

Make sure the right person is reading

Set read challenges for recipients

  • SMS: Send a one-time code to your recipient's mobile phone or tablet.
  • Q&A: Ask your recipient a question only they could correctly answer.
Woman reading secure message on her phone

Smart alerts

Prevent a leak
before it happens

Get reminders to encrypt sensitive info

If Mailock thinks it sees sensitive information in your email, it'll tell you. Smart alerts prevent data leaks and they train you and your colleagues to become more intentional about what you send over open-risk email.

Man looking at emails with anxiety


"It sits in my email, and I don’t think about it as being Mailock, I just think about it as being email."

Sam Whybrow Thanks Wealth Planning
Wealth planning meeting to discuss email encryption usage and savings

Running M365?

Explore our enterprise solution.


Turn email into your greatest power

Transform communications, meet business goals, and make email a force for good.

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Increase efficiency

Save time spent sending sensitive documents back and forth, such as in AML and KYC processes. Speed is key to a positive client experience according to 80% surveyed.

ESG presentation

Save paper

Let’s get to Net Zero together. Digitise sensitive document exchanges. The financial industry’s annual paper output is estimated at over 507 million documents, the equivalent of 50,000 trees.

Man stressed out over cybersecurity

Protect data

Free your business from open-risk email. Protect messages and attachments from cyber threat and human error. Exchange documents securely with customers and keep their data safe.


Multilayer email security

Cybercrime is rising, but it's not the most common reason for data loss. Emailing the wrong person is the primary cause of incidents. That's why our Mailock for Outlook add-in doesn't just encrypt, it also protects messages from human error.

Human error

Ensure emails sent to the wrong recipient remain secure. Use 2-factor authentication so only the right people can gain access. Full Revoke provides you with a last resort option to strip access.

woman looking at email security system in dark office

Cyber threat

Fortify your comms against bad actors, with military-grade AES-256 encryption. Mailock safeguards your confidential data on its journey and at rest on your mail server and in your recipients' inboxes.


Risk training

Customisable security alerts train employees at the point of sending to encrypt emails containing sensitive data. Mailock scans your emails for key information that your business considers sensitive to prevent data loss.

Risk training
woman looking at email security system in dark office
Risk training


“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


“An investment firm shall 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.” — ESMA, 2021

ISO 27001

“You should use encrypted communication channels when transmitting personal data. You should have an encryption policy in place that governs how and when you implement encryption, and you should also train your staff in the use and importance of encryption. When storing or transmitting personal data, you should use encryption and ensure that your encryption solution meets current standards.” — ICO, 2021

man and woman training how to use the outlook encryption add-in

Mailock For Outlook

See our pricing plans

Find the plan that suits your business.

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