/**
 * SMTP Client
 * Send, reply, and forward emails via SMTP using Nodemailer
 */
import type { AccountConfig } from './config.js';
export interface EmailAttachment {
    filename: string;
    content_base64: string;
    content_type?: string;
}
export interface SendEmailOptions {
    to: string;
    subject: string;
    body: string;
    cc?: string;
    bcc?: string;
    in_reply_to?: string;
    references?: string;
    attachments?: EmailAttachment[];
}
export interface SendResult {
    success: boolean;
    message_id: string;
    raw?: Buffer;
}
/**
 * Convert markdown text to simple HTML for email.
 * Uses sanitize-html to sanitize the output HTML against XSS vectors like javascript: links.
 */
export declare function textToHtml(text: string): string;
/**
 * Send a new email
 */
export declare function sendNewEmail(account: AccountConfig, options: SendEmailOptions): Promise<SendResult>;
/**
 * Reply to an email (maintains thread via In-Reply-To and References headers)
 */
export declare function replyToEmail(account: AccountConfig, options: SendEmailOptions): Promise<SendResult>;
/**
 * Forward an email
 */
export declare function forwardEmail(account: AccountConfig, options: SendEmailOptions & {
    original_body: string;
}): Promise<SendResult>;
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