import { SentlyError } from "../core/errors.js";
import type { MailOptions, SendResult, Transport, VerifyResult } from "../core/types.js";
/** Postmark API configuration. */
export interface PostmarkConfig {
    /** Postmark server API token. */
    serverToken: string;
}
/** Error thrown when the Postmark API returns a non-success response. */
export declare class PostmarkError extends SentlyError {
    readonly statusCode: number;
    readonly apiError: unknown;
    /** Creates a Postmark API error with status code and response payload. */
    constructor(message: string, statusCode: number, apiError: unknown);
}
/**
 * Postmark HTTP API transport.
 */
export declare class PostmarkTransport implements Transport {
    readonly provider = "postmark";
    /** Postmark server API token for the X-Postmark-Server-Token header. */
    private readonly serverToken;
    /** Creates a Postmark transport with the given server token. */
    constructor(config: PostmarkConfig);
    /** Sends an email via the Postmark HTTP API. */
    send(options: MailOptions): Promise<SendResult>;
    /** Verifies the Postmark server token by fetching server info. */
    verify(): Promise<VerifyResult>;
}