import { ConfigService } from '@nestjs/config';
import { MailAdapter } from './mail.adapter';
import { MailModuleOptions } from '../mail.module';
import { MailAttachment } from '../mail.service';
export declare class SmtpAdapter implements MailAdapter {
    private mailModuleOptions;
    private configService;
    private readonly transporter;
    private readonly senderName;
    private readonly senderAddress;
    constructor(mailModuleOptions: MailModuleOptions, configService: ConfigService);
    sendMail(to: string, subject: string, text: string, html?: string, attachments?: MailAttachment[]): Promise<boolean>;
    checkConnection(): Promise<boolean>;
}