export interface PostmarkConfig {
    /** Postmark server token (sent in `X-Postmark-Server-Token` header). */
    serverToken: string;
    /** Default sender email address. */
    from: string;
    /** Optional display name composed alongside `from` as `Name <addr>`. */
    senderName?: string;
    /**
     * Optional message stream id (e.g. 'outbound' for transactional, 'broadcasts'
     * for marketing). Applied to every send unless overridden via
     * `_passthrough.body.MessageStream` at v1.0.
     */
    messageStream?: string;
    /** Optional BYO fetch implementation (defaults to `globalThis.fetch`). */
    fetch?: typeof fetch;
}