/**
 * Email provider auto-detection by domain.
 *
 * Maps common email domains to their IMAP/SMTP server settings.
 */
import type { ProviderConfig } from '../types/index.js';
export declare const PROVIDERS: ProviderConfig[];
/**
 * Detect email provider from an email address.
 * Returns the matching provider config or undefined.
 */
export declare function detectProvider(email: string): ProviderConfig | undefined;
/**
 * Identify the provider behind a configured account.
 *
 * The SMTP host is the strongest signal (it also catches custom domains
 * routed through a known provider, e.g. ProtonMail Bridge on 127.0.0.1);
 * the email domain is the fallback for custom relays.
 */
export declare function findProviderForAccount(account: {
    email: string;
    smtp: {
        host: string;
    };
}): ProviderConfig | undefined;
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