/**
 * @module notification.healthcheck.mailgun
 *
 * Issue codes emitted by the Mailgun-backed email health check.
 *
 * These live here, rather than next to the server-side check that emits them, so a browser can ship a
 * first-class presentation for each code without re-declaring the strings. The check itself stays in
 * `@dereekb/firebase-server/model` and imports these codes from here.
 */
/**
 * Issue codes emitted by the Mailgun email health check.
 *
 * These are Mailgun-specific and sit alongside the library's own
 * {@link KnownNotificationHealthCheckIssueCode} values.
 */
export declare enum MailgunNotificationHealthCheckIssueCode {
    /**
     * The address is on the domain's bounce suppression list, so Mailgun drops every message to it.
     */
    SUPPRESSED_BOUNCE = "mailgunSuppressedBounce",
    /**
     * The address is on the domain's spam complaint list, so Mailgun drops every message to it.
     */
    SUPPRESSED_COMPLAINT = "mailgunSuppressedComplaint",
    /**
     * The address is on the domain's unsubscribe list.
     */
    SUPPRESSED_UNSUBSCRIBE = "mailgunSuppressedUnsubscribe",
    /**
     * A recent message to the address failed or was rejected.
     */
    RECENT_DELIVERY_FAILURE = "mailgunRecentDeliveryFailure",
    /**
     * A recent message to the address was delivered successfully.
     */
    RECENT_DELIVERY_SUCCESS = "mailgunRecentDeliverySuccess",
    /**
     * No email activity was recorded for the address in the window that was inspected.
     */
    NO_RECENT_ACTIVITY = "mailgunNoRecentActivity",
    /**
     * The sending domain is not active, which blocks delivery for everyone.
     */
    DOMAIN_NOT_ACTIVE = "mailgunDomainNotActive",
    /**
     * Address validation says the address cannot receive mail.
     */
    ADDRESS_UNDELIVERABLE = "mailgunAddressUndeliverable",
    /**
     * The address belongs to a disposable email provider.
     */
    ADDRESS_DISPOSABLE = "mailgunAddressDisposable",
    /**
     * A probe was requested but no probe message builder is configured.
     */
    PROBE_NOT_CONFIGURED = "mailgunProbeNotConfigured"
}