export interface EmailTransport {
    send(params: SendEmailParams): Promise<void>;
}
export interface SendEmailParams {
    /**
     * Sender address (optionally `Display Name <addr@example.com>`). A per-send
     * `from` always wins; when omitted, a transport may fall back to its own
     * configured default (e.g. the Lettermint transport's `from`). Handlers resolve
     * it from `config.email.from` — see {@link EmailConfig} — so every outbound mail
     * carries a consistent From. Transports that require a sender (Lettermint) throw
     * when neither a per-send nor a configured `from` is set.
     */
    from?: string;
    to: string;
    subject: string;
    html: string;
    text?: string;
}