import { SentlyError } from "../core/errors.js";
import type { MailgunConfig, MailOptions, SendResult, Transport, VerifyResult } from "../core/types.js";
/** Error thrown when the Mailgun API returns a non-success response. */
export declare class MailgunError extends SentlyError {
    readonly statusCode: number;
    readonly apiError: unknown;
    /** Creates a Mailgun API error with status code and response payload. */
    constructor(message: string, statusCode: number, apiError: unknown);
}
/**
 * Mailgun HTTP API transport (multipart/form-data).
 */
export declare class MailgunTransport implements Transport {
    readonly provider = "mailgun";
    /** Mailgun API key for basic authentication. */
    private readonly apiKey;
    /** Mailgun sending domain. */
    private readonly domain;
    /** Mailgun API base URL (US or EU region). */
    private readonly baseUrl;
    /** Creates a Mailgun transport with the given API key and domain. */
    constructor(config: MailgunConfig);
    /** Sends an email via the Mailgun Messages API. */
    send(options: MailOptions): Promise<SendResult>;
    /** Verifies the Mailgun API key by listing domains. */
    verify(): Promise<VerifyResult>;
}