import type { Attachment } from 'nodemailer/lib/mailer';
export interface MailInfo {
    to: string[];
    cc?: string[];
    bcc?: string[];
    subject: string;
    content: string;
    attachments?: MailAttachment[] | Attachment[];
}
export interface MailAttachment {
    name: string;
    prefix: string;
    filename: string;
}
export declare function isMailAttachment(attachment: any): attachment is MailAttachment;
export declare function isAttachment(attachment: any): attachment is Attachment;