export interface MimeMessage {
    headers: Record<string, string>;
    from: string;
    to: string;
    cc: string;
    subject: string;
    date: string;
    messageId: string;
    inReplyTo: string;
    contentType: string;
    textBody: string;
    htmlBody: string;
    attachments: MimeAttachment[];
}
export interface MimeAttachment {
    filename: string;
    contentType: string;
    size: number;
    content: Buffer;
}
/**
 * Parse a raw email message into structured parts.
 */
export declare function parseMessage(raw: string): MimeMessage;
/**
 * Strip HTML tags and return plain text.
 */
export declare function htmlToText(html: string): string;
/**
 * Build a MIME message with optional attachments.
 */
export declare function buildMimeMessage(options: {
    from: string;
    to: string;
    cc?: string;
    bcc?: string;
    subject: string;
    textBody?: string;
    htmlBody?: string;
    inReplyTo?: string;
    references?: string;
    attachments?: {
        filename: string;
        path: string;
    }[];
}): string;
/**
 * Format a file size in human-readable form.
 */
export declare function formatFileSize(bytes: number): string;