How we process data.

This page describes account and service data. The protection model for correspondence itself is explained separately on the Privacy and security page.

Last updated: 27 July 2026.

Data controller

The data controller is Joanna Szamota, carrying on a sole-trader business under the registered name Joanna Szamota Blackgrain Workshop, ul. Zachodnia 24, 05-822 Milanówek, Masovian Voivodeship, Poland, NIP 5291840195, REGON 521704456. For privacy matters, use the protected contact form.

Data we process

We process account data, email address, profile name, preferences, technical data needed for security and service delivery, plan information, and requests sent through the contact form. The server stores encrypted letter envelopes and does not receive readable letter content.

Purposes and legal bases

We use data to perform the service contract, maintain accounts, deliver letters, handle payments and support requests, protect the service, and meet legal obligations. Where a feature relies on consent, you may withdraw it at any time.

Providers and recipients

We use infrastructure, authentication, hosting, form protection, transactional email, and payment providers. They receive only the data needed to perform their service and operate under appropriate agreements and safeguards.

Retention

We keep account data while you use the service and for the period required for settlements or legal claims. Support request data is kept only as long as needed to resolve the matter. Account deletion starts the permanent deletion process described in the application.

Your rights

You may request access, correction, deletion, restriction, portability, or object to processing. You may also lodge a complaint with the competent data protection authority.

Cookies and local storage

We use items necessary for sign-in, security, language and currency preferences, and interface settings. We do not use correspondence content for advertising or advertising profiles.

Contact and changes

Send data questions through the Contact form. If this policy changes materially, we will update the date on this page and, where appropriate, notify users in the application.