import { MailTransport, type DeliveryAcceptance, type DeliveryUpdate, type MailMessage } from '@doxajs/core';
export interface SendGridOptions {
    readonly apiKey: string;
    readonly endpoint?: string;
    readonly fetch?: typeof globalThis.fetch;
}
export declare class SendGridMailTransport extends MailTransport {
    private readonly options;
    constructor(options: SendGridOptions);
    send(message: MailMessage): Promise<DeliveryAcceptance>;
}
export declare function verifySendGridWebhook(rawBody: string, timestamp: string, signature: string, publicKey: string): boolean;
export declare function normalizeSendGridEvents(rawBody: string): readonly DeliveryUpdate[];
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