import { MailConfig, MailDefaults, MailTransporter } from './types';
export declare class SMTPProvider {
    private readonly _config;
    private readonly _transport;
    private readonly _defaults;
    constructor(config: MailConfig, transport?: MailTransporter, defaults?: MailDefaults);
    /**
     * Set Mail Config
     * @returns
     */
    /**
     * Set Mail Options
     * @param params
     * @returns
     */
    private _setMailOptions;
    /**
     * Client
     * @returns
     */
    private _client;
    /**
     * Initialize Mail Service
     */
    initialize(): void;
    /**
     * Send Mail Config Transporter
     * @param params
     */
    private _sendMail;
    /**
     * `Send Mail with Nodemailer`
     * @param to
     * @param subject
     * @param template
     */
    send(to: string | string[], subject: string, template: string): void;
}
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