import nodemailer from "nodemailer";
import type { SmtpClientOptions, EmailSendResult } from "../types.js";
import type { EmailLogger } from "../utils/logger.js";
/**
 * Create SMTP transport
 */
export declare function createSmtpTransport(options: SmtpClientOptions): nodemailer.Transporter<import("nodemailer/lib/smtp-transport/index.js").SentMessageInfo, import("nodemailer/lib/smtp-transport/index.js").Options>;
/**
 * Send email options
 */
interface SendEmailOptions {
    /** Transport instance (optional, will create if not provided) */
    transport?: ReturnType<typeof nodemailer.createTransport>;
    /** Sender email */
    from: string;
    /** Recipient email(s) */
    to: string | string[];
    /** CC recipients (optional) */
    cc?: string | string[];
    /** Email subject */
    subject: string;
    /** Plain text body */
    text: string;
    /** HTML body (optional) */
    html?: string;
    /** Attachments */
    attachments?: Array<{
        filename: string;
        content: Buffer;
        contentType?: string;
    }>;
    /** In-Reply-To header for threading */
    inReplyTo?: string;
    /** References header for threading */
    references?: string[];
    /** Custom headers */
    headers?: Record<string, string>;
}
/**
 * Send email via SMTP
 */
export declare function sendEmail(options: SendEmailOptions, log?: EmailLogger): Promise<EmailSendResult>;
/**
 * Send email with config (convenience function)
 */
export declare function sendEmailWithConfig(config: SmtpClientOptions, options: Omit<SendEmailOptions, "transport">, log?: EmailLogger): Promise<EmailSendResult>;
export {};