/**
 * Email Core — IMAP read (ImapFlow) + SMTP send (nodemailer). Zero database.
 *
 * Supports Gmail OAuth2, Outlook OAuth2, and generic IMAP/SMTP.
 * Attachments up to 25MB. Thread-aware replies.
 * Connection pooling for IMAP with idle timeout cleanup.
 *
 * Migrated from `imap` (callback-based, unmaintained since 2017)
 * to `imapflow` (async/await, actively maintained, MIT).
 */
export interface EmailMessage {
    uid: number;
    messageId: string;
    from: string;
    fromName: string;
    to: string;
    cc?: string;
    subject: string;
    date: string;
    textBody: string;
    htmlBody?: string;
    inReplyTo?: string;
    references?: string[];
    attachments: Array<{
        filename: string;
        size: number;
        contentType: string;
    }>;
    flags: string[];
    folder: string;
}
export interface SendInput {
    to: string;
    cc?: string;
    bcc?: string;
    subject: string;
    text: string;
    html?: string;
    replyTo?: string;
    inReplyTo?: string;
    references?: string[];
    attachments?: Array<{
        path: string;
        filename?: string;
    }>;
    from?: string;
}
export interface SendResult {
    success: boolean;
    messageId?: string;
    error?: string;
}
export declare function listEmails(folder?: string, options?: {
    limit?: number;
    unseen?: boolean;
    search?: string;
}): Promise<{
    emails: EmailMessage[];
    total: number;
}>;
export declare function readEmail(uid: number, folder?: string): Promise<EmailMessage | null>;
export declare function searchEmails(query: string, folder?: string, limit?: number): Promise<EmailMessage[]>;
export declare function listFolders(): Promise<Array<{
    name: string;
    delimiter: string;
    children?: string[];
}>>;
export declare function moveEmail(uid: number, fromFolder: string, toFolder: string): Promise<boolean>;
/** Clear cached SMTP transporter (call after config changes). */
export declare function invalidateTransporterCache(): void;
export declare function sendEmail(input: SendInput): Promise<SendResult>;
export declare function setEmailFlags(uid: number, folder: string, flags: string[], add: boolean): Promise<boolean>;
export declare function deleteEmail(uid: number, folder: string): Promise<boolean>;
export declare function forwardEmail(uid: number, to: string, options?: {
    folder?: string;
    text?: string;
    attachments?: Array<{
        path: string;
        filename?: string;
    }>;
}): Promise<SendResult>;
export declare function replyToEmail(uid: number, text: string, options?: {
    html?: string;
    folder?: string;
    attachments?: Array<{
        path: string;
        filename?: string;
    }>;
}): Promise<SendResult>;
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