# Cyrus IMAP Server: Cyrus Internals

These documents are intended for persons interested in contributing to the Cyrus IMAP development effort, or for those interested in lower- level details about how Cyrus is implemented.

## The Cyrus IMAP Server Distribution

Cyrus IMAP Server distribution

Cyrus Internals

- Index API
- Database Formats
- Sieve Bytecode
- Mailbox API
- Mailbox Format
- Internationalization
- Namelocks
- Prot Layer
- Unit Tests
- var directory structure
- Replication Protocol
- Replication Examples
- Special Characters
- Enabling improved_mboxlist_sort