Send annual returns

Send annual returns securely

Mailock lets you securely send annual returns to an email address by encrypting them and verifying your recipients.

Free for 5 sends per month

Upgrade for unlimited sends

Why protect annual returns securely?

Annual returns contain sensitive company details, like revenue and shareholder info. A data leak could harm your business or lead to fines. Using secure methods to handle this information helps keep your company safe and compliant.

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Can't I just email an annual return?

Emailing annual returns can be dangerous. These documents contain private company data, which could be used against you if intercepted. Secure your email with encryption to keep your business information safe.

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How sensitive is the data in an annual return?

Based on our analysis of potential risk factors, we've given annual returns a sensitivity rating of 70 out of 100.

Data at risk:

Company financials
Shareholder information
Corporate address
Director details

Sensitivity rating - 70

How to send your annual return safely

Easily send your annual return with Mailock to protect them with advanced security.

Step 1. Create a free account

Create your free Mailock account by adding some basic information.

Step 1. Create a free Mailock account

Step 2. Drag and drop your files

Drag and drop your files onto a new message, enter your recipients' emails, a subject line, and a note.

Step 2. Drag and drop your files

Step 3. Set a challenge and send

Hit send and set a security question for your recipient to answer if needed.

Step 3. Set a challenge and send!
Step 1. Create a free Mailock account
Step 2. Drag and drop your files
Step 3. Set a challenge and send!

Effortless filing

Filing our annual returns was effortless with Mailock. So convenient!

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Mailock user

Confidential transfer

I knew our company’s sensitive data was safe, which put me at ease.

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Mailock user

Business safe

Mailock is a lifesaver for keeping our business details secure and private.

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Mailock user

* How do we calculate sensitivity ratings?

We calculate sensitivity ratings based on the type, volume, and potential misuse of the information contained in each document.

Here’s how it works:

Type of Information

Documents containing highly sensitive details—such as personal identifiers, financial data, legal records, or biometric information—receive higher ratings.

Volume of Sensitive Information

The more sensitive details a document contains, the higher the score. For example, a tax document with extensive personal and financial data scores higher than a single-page appraisal.

Likelihood and Impact of Misuse

Documents that pose a greater risk if intercepted—like credit card details or bank statements—receive higher ratings. We also consider the consequences of a breach, such as fraud or identity theft.

Audience and Context

Some documents, like asylum applications or legal case files, are rated higher due to the severe personal, professional, or legal consequences of exposure.

Scoring Scale

85–100: Highly sensitive, with significant risk if exposed (e.g., credit card details, biometric data).

70–84: Moderately sensitive, containing private or exploitable information (e.g., tax documents, bank statements).

Below 70: Lower sensitivity, but still requiring secure handling (e.g., property appraisals).

This method ensures our sensitivity ratings accurately reflect the level of protection needed for each document type.

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Get started

Send your annual return now

Sign up for a free Mailock account to securely send your information now.