def init():
    # Same TLS cert for all handlers
    cert_file = "./localhost.pem"
    key_file = "./localhost-key.pem"

    # SMTP Inbound
    reception_addr = os.getenv("RECEPTION_ADDR", "0.0.0.0:10025")
    mda.listen(
        address = reception_addr,
        role = "smtp_inbound",
        tls_cert_file = cert_file,
        tls_key_file = key_file,
    )

    # SMTP Submission
    submission_addr = os.getenv("SUBMISSION_ADDR", "0.0.0.0:465")
    mda.listen(
        address = submission_addr,
        role = "smtp_submission",
        tls_cert_file = cert_file,
        tls_key_file = key_file,
    )

    # SMTP Local Submission
    mda.listen(
        address = "127.0.0.1:12325",
        role = "smtp_local_submission",
        tls_cert_file = "",
        tls_key_file = "",
    )

    # IMAP
    imap_addr = os.getenv("IMAP_ADDR", "0.0.0.0:993")
    mda.listen(
        address = imap_addr,
        role = "imap",
        tls_cert_file = cert_file,
        tls_key_file = key_file,
    )

def on_message_deliver(conn, user, msg):
    if msg.header_to.address.startswith("extra-address"):
        return "extra"
    dec = user.gatekeeper.get_decision(msg)
    if not dec:
        return "Gatekeeper"
    return dec

def on_message_moved(user, msg, source_folder, dest_folder):
    if source_folder == "Gatekeeper" and dest_folder in ["Junk", "Trash"]:
        user.gatekeeper.route_to(msg.header_from, "Junk")
        return
    if source_folder == "Gatekeeper":
        user.gatekeeper.route_to(msg.header_from, "INBOX")

def on_message_submit(user, msg):
    return {
        "host": "relay.p25.dev",
        "port": 2587,
        "username": os.getenv("RELAY_USERNAME", ""),
        "password": os.getenv("RELAY_PASSWORD", ""),
    }