Titlani

Misfin(C) mail protocol client and server library for Python.

Titlani is a complete implementation of the Misfin(C) mail transport protocol -- a lightweight, privacy-focused mail protocol influenced by Gemini that uses mandatory TLS with self-signed identity certificates and Trust-On-First-Use (TOFU) validation.

Features

• Full Misfin(C) protocol -- Wire format parsing, status codes, gemmail message format
• Async client and server -- Built on asyncio.Protocol with TLS, TOFU, redirect handling, and middleware
• Identity certificates -- Generate and manage Misfin identity certs with custom layout (USER_ID, CN, SAN DNS)
• At-rest encryption -- Per-mailbox X25519 ECDH + AES-256-GCM encryption for stored messages
• Sender verification -- Probe-based and SPKI-based verification with SQLite caching
• GMAP -- Gemini Mailbox Access Protocol for remote mailbox access with tag management
• Mailing lists -- Server-side mailing list support with subscriber management and message forwarding
• Rate limiting and access control -- Token bucket rate limiting and IP allow/deny lists via tlacacoca
• Contact blocking -- Per-mailbox sender block lists
• Auto-reply -- Server-side out-of-office automatic replies with loop prevention
• CLI tool -- Full-featured titlani command for sending, serving, reading mail, and administration

Installation

With uv (preferred):

uv tool install titlani 

Or with pip:

pip install titlani

Requires Python 3.13+.

Quick Start

Generate an identity, send a message, and start a server:

# Generate an identity certificate
titlani identity generate alice example.com --blurb "Alice Smith"

# Send a message
titlani send bob@remote.host "Hello from Misfin!" \
    --cert alice.pem --key alice.key --subject "Greetings"

# Generate server and client config interactively
titlani init

# Start a server (auto-discovers config from ~/.config/titlani/)
titlani serve

# List and read your mail
titlani mail list
titlani mail read 1

Or use the Python API:

import asyncio
from titlani import MisfinClient

async def main():
    async with MisfinClient(
        client_cert="alice.pem",
        client_key="alice.key",
    ) as client:
        response = await client.send(
            to="bob@remote.host",
            body="Hello from Misfin!",
            subject="Greetings",
        )
        print(f"{response.status} {response.meta}")

asyncio.run(main())

Documentation

Full documentation is available at titlani.readthedocs.io:

• Quick Start -- Core workflow in 6 steps
• Tutorials -- Step-by-step guides for sending messages, running servers, and building clients
• How-To Guides -- Recipes for encryption, verification, GMAP, mailing lists, and more
• CLI Reference -- All titlani commands and options
• Configuration Reference -- Server and client TOML config
• API Reference -- Python API documentation

License

See LICENSE for details.