> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lerian.studio/llms.txt
> Use this file to discover all available pages before exploring further.

# What is Lerian BC Correios?

> Lerian BC Correios connects your institution to BC Correio, BACEN's electronic correspondence system. It collects your mail, keeps it with an audit trail, and sends your messages to BACEN departments.

**Lerian BC Correios** is the Lerian service for **BC Correio**, the electronic correspondence system of the Central Bank of Brazil (BACEN). Supervised institutions receive official mail from BACEN in BC Correio, such as resolutions, circulars, and communications. They also use it to send messages to BACEN departments.

BC Correio is a BACEN web service on the internet. It does not use the RSFN. Each request carries the Sisbacen user and password of your institution.

BACEN does not push mail to your institution. Lerian BC Correios asks BC Correio for new mail on a schedule that you choose, stores each mail, and gives your teams one API to read it.

Lerian BC Correios keeps the data of each tenant apart. It reads the tenant from the `tenant_id` claim of the bearer token.

## What Lerian BC Correios does and does not do

***

**Lerian BC Correios does:**

* Collects the mail of every BC Correio folder your Sisbacen user can see, with its attachments.
* Stores each mail and its attachments, and checks the SHA-256 checksum of an attachment when you download it.
* Sends a text message to a BACEN department and keeps the protocol number that BC Correio returns.
* Marks a mail as read, archives it, or restores it in your local mailbox.
* Applies the retention period of each tenant, and deletes mail that passes it.
* Records who read, downloaded, sent, archived, or restored a mail in an audit trail that you can export.
* Analyzes mail with an AI provider that you configure, with your own API key.

**Lerian BC Correios does not:**

* **Send attachments to BACEN.** A message that you send is text, with no attachment.
* **Transfer files with BACEN.** [Lerian STA](/en/rails/sta/what-is-lerian-sta) is the rail for file exchange with BACEN.
* **Change the state of a mail in BC Correio.** Read, archive, and restore change your local copy only.
* **Read BACEN normative documents.** Lerian BC Correios reads the mail folders of BC Correio.

## Who it serves

***

Lerian BC Correios serves supervised institutions that receive BACEN mail in BC Correio. Your compliance and back-office teams read that mail and answer BACEN through one API, with an audit trail.

One deployment can serve several tenants. Each tenant keeps its own settings, BC Correio credentials, and mail.

## Glossary

***

| Term | Meaning |
| - | - |
| **BC Correio** | BACEN's electronic correspondence system for supervised institutions. |
| **Sisbacen** | The BACEN access system. Your Sisbacen user and password give access to BC Correio. |
| **Folder** | A BC Correio mailbox, such as the inbox or the sent folder. Lerian BC Correios maps each folder to a local folder. |
| **Destination** | The code of the BACEN department that receives a message you send, for example `DEINF`. |
| **Protocol number** | The number BC Correio returns for a message that it accepts. The API returns it as `bcbConfirmationId`. |
| **Mail type** | The class of a mail: `RESOLUTION`, `CIRCULAR`, `COMMUNICATION`, or `OTHER`. |
| **Retention period** | The number of days a tenant keeps its mail before Lerian BC Correios deletes it. |
| **AI insight** | The analysis of a mail that the AI provider of the tenant returns. |

See also [Native messaging and partner interfaces](/en/rails/native-messaging).


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