/**
 * Relay config helpers for better-email-mcp.
 *
 * The live credential path is in `credential-state.ts` (stdio fallback
 * spawns a LOCAL `runLocalServer`; HTTP modes mount via `transports/http.ts`).
 * This module exposes:
 *  - `formatCredentials`: reads a STORED config blob (`{ EMAIL_CREDENTIALS }`
 *    or legacy per-field) back into the `EMAIL_CREDENTIALS` string.
 *  - `assembleEmailCredentials`: encodes the `accounts` array submitted by
 *    mcp-core's card-group credential form into that same string.
 */
/**
 * Format a stored relay config into the EMAIL_CREDENTIALS string.
 *
 * Supports two stored shapes:
 * - New (multi-account): { EMAIL_CREDENTIALS: "email1:pass1,email2:pass2" }
 * - Legacy (single account): { email, password, imap_host? }
 */
export declare function formatCredentials(config: Record<string, string>): string;
/** One account card as submitted by mcp-core's card-group credential form. */
export interface EmailAccountCard {
    email?: string;
    password?: string;
    imap_host?: string;
    imap_port?: string;
}
/**
 * Encode the `accounts` array from the card-group credential form into the
 * comma-separated EMAIL_CREDENTIALS string. Mirrors the encoder that used to
 * live client-side in the forked `credential-form.ts`:
 *  - Outlook/Hotmail/Live: the email only (server runs the device-code flow;
 *    any password typed is ignored).
 *  - Others: `email:password[:imap_host[:imap_port]]`. The port is appended
 *    only when the host carries no colon of its own.
 * Cards without an email — and non-Outlook cards without a password — are
 * skipped, matching the fork's submit-time filter.
 */
export declare function assembleEmailCredentials(accounts: EmailAccountCard[] | undefined): string;
/**
 * Emails of the cards `assembleEmailCredentials` would drop: an address was
 * typed but no password, and the domain is not on the OAuth path. The encoder
 * skips those silently — correct for an encoder, wrong as the end of the story,
 * because the submitter sees no error and nothing happens (reported in #1049
 * for an M365 custom domain). The transport calls this first and names them.
 */
export declare function findUnusableAccountCards(accounts: EmailAccountCard[] | undefined): string[];
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