/**
 * Email validation constants based on RFC 5321
 *
 * These limits are defined in RFC 5321 Section 4.5.3.1:
 * - Maximum total email length: 254 characters
 * - Maximum local part length: 64 characters
 * - Maximum domain length: 253 characters
 */
export declare const EmailLimits: {
    /** Maximum total email address length (local + @ + domain) */
    readonly MAX_EMAIL_LENGTH: 254;
    /** Maximum local part length (before @) */
    readonly MAX_LOCAL_PART_LENGTH: 64;
    /** Maximum domain length (after @) */
    readonly MAX_DOMAIN_LENGTH: 253;
};
/**
 * Memory calculation constants
 */
export declare const MemoryConstants: {
    /** Bytes per kilobyte */
    readonly BYTES_PER_KB: 1024;
    /** Kilobytes per megabyte */
    readonly KB_PER_MB: 1024;
};
/**
 * DNS detection defaults
 */
export declare const DnsConstants: {
    /** Default DNS query timeout in milliseconds */
    readonly DEFAULT_TIMEOUT_MS: 5000;
    /** Max DNS detection attempts per process per rolling minute */
    readonly MAX_REQUESTS_PER_MINUTE: 10;
};
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