/**
 * Email notification channel
 */
import type { CcanywhereConfig } from '../../types/index.js';
import type { ChannelNotifier, NotificationMessage } from './types.js';
export declare class EmailNotifier implements ChannelNotifier {
    readonly channel: "email";
    private readonly config;
    constructor(config: NonNullable<NonNullable<CcanywhereConfig['notifications']>['email']>);
    send(message: NotificationMessage): Promise<void>;
    /**
     * Send email via SMTP
     */
    private sendViaSmtp;
    /**
     * Send email via local mail command
     */
    private sendViaLocalMail;
    /**
     * Send email via sendmail command
     */
    private sendViaSendmail;
    /**
     * Test email configuration
     */
    test(): Promise<boolean>;
    /**
     * Send a test email
     */
    sendTest(): Promise<void>;
    /**
     * Check if local mail commands are available
     */
    static isLocalMailAvailable(): Promise<{
        mail: boolean;
        sendmail: boolean;
    }>;
}
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