import { type H3Event } from 'h3';
/**
 * Validates MailChannels webhooks on the Edge
 * @see {@link https://docs.mailchannels.net/email-api/advanced/delivery-events/#verifying-message-signatures}
 * @param event H3Event
 * @returns {boolean} `true` if the webhook is valid, `false` otherwise
 */
export declare const isValidMailChannelsWebhook: (event: H3Event) => Promise<boolean>;