import type { Update } from './types.js';
export interface SendEmailArgs {
    update: Update;
    to: string;
    from?: string;
    replyTo?: string;
    viewerUrl: string;
    apiKey?: string;
}
export interface EmailResult {
    delivered: boolean;
    messageId?: string;
    reason?: string;
}
export declare function deliverUpdateEmail(args: SendEmailArgs): Promise<EmailResult>;