import { b as MxCheckResult, C as Cache, c as MxRecord } from "../packem_shared/mx.d-HxIDdxvR.js";
/**
 * Options for SMTP verification.
 */
interface SmtpVerificationOptions {
  /** Cache for the underlying MX lookup. */
  cache?: Cache<MxCheckResult>;
  /**
   * Number of random, almost-certainly-nonexistent addresses to probe for
   * catch-all detection. More probes reduce false positives from
   * deferred-rejection servers. Set to 0 to disable.
   * @default 1
   */
  catchAllProbes?: number;
  /**
   * MAIL FROM address used during the probe; defaults to `verify@` followed by
   * the HELO host.
   */
  fromEmail?: string;
  /**
   * HELO/EHLO hostname presented to the remote server.
   * @default the address domain
   */
  heloHost?: string;
  /**
   * Pre-resolved MX records to probe, in priority order. When provided, the
   * probe skips its own DNS lookup — the orchestrator passes the records it
   * already resolved so the domain is not queried twice.
   */
  mxRecords?: MxRecord[];
  port?: number;
  /**
   * Number of times to retry the whole probe on a temporary (greylist) failure.
   * @default 1
   */
  retries?: number;
  /**
   * Delay in milliseconds between greylist retries.
   * @default 5000
   */
  retryDelay?: number;
  /** Cache for SMTP results. */
  smtpCache?: Cache<SmtpVerificationResult>;
  timeout?: number;
  ttl?: number;
}
/**
 * Detailed result of an SMTP verification attempt.
 */
interface SmtpVerificationResult {
  /** True when the server accepts a random, nonexistent recipient (catch-all). */
  acceptAll?: boolean;
  /** The numeric SMTP status code for the real RCPT TO. */
  code?: number;
  /** True when the result is inconclusive due to a temporary failure (greylisting). */
  deferred?: boolean;
  /** Final enhanced status code for the real RCPT (e.g. "5.1.1"), if present. */
  enhancedCode?: string;
  error?: string;
  /** True when the mailbox exists but is over quota (452/552 / 4.2.2). */
  mailboxFull?: boolean;
  mxRecords?: MxRecord[];
  smtpResponse?: string;
  /** True when the real RCPT TO was accepted (250). */
  valid: boolean;
}
declare const verifySmtp: (email: string, options?: SmtpVerificationOptions) => Promise<SmtpVerificationResult>;
export { type SmtpVerificationOptions, type SmtpVerificationResult, verifySmtp as default, verifySmtp };