/**
 * SMTP Server Constants
 * This file contains all constants and enums used by the SMTP server
 */
import { SmtpState } from '../interfaces.js';
export { SmtpState };
/**
 * SMTP Response Codes
 * Based on RFC 5321 and common SMTP practice
 */
export declare enum SmtpResponseCode {
    SUCCESS = 250,// Requested mail action okay, completed
    SYSTEM_STATUS = 211,// System status, or system help reply
    HELP_MESSAGE = 214,// Help message
    SERVICE_READY = 220,// <domain> Service ready
    SERVICE_CLOSING = 221,// <domain> Service closing transmission channel
    AUTHENTICATION_SUCCESSFUL = 235,// Authentication successful
    OK = 250,// Requested mail action okay, completed
    FORWARD = 251,// User not local; will forward to <forward-path>
    CANNOT_VRFY = 252,// Cannot VRFY user, but will accept message and attempt delivery
    MORE_INFO_NEEDED = 334,// Server challenge for authentication
    START_MAIL_INPUT = 354,// Start mail input; end with <CRLF>.<CRLF>
    SERVICE_NOT_AVAILABLE = 421,// <domain> Service not available, closing transmission channel
    MAILBOX_TEMPORARILY_UNAVAILABLE = 450,// Requested mail action not taken: mailbox unavailable
    LOCAL_ERROR = 451,// Requested action aborted: local error in processing
    INSUFFICIENT_STORAGE = 452,// Requested action not taken: insufficient system storage
    TLS_UNAVAILABLE_TEMP = 454,// TLS not available due to temporary reason
    SYNTAX_ERROR = 500,// Syntax error, command unrecognized
    SYNTAX_ERROR_PARAMETERS = 501,// Syntax error in parameters or arguments
    COMMAND_NOT_IMPLEMENTED = 502,// Command not implemented
    BAD_SEQUENCE = 503,// Bad sequence of commands
    COMMAND_PARAMETER_NOT_IMPLEMENTED = 504,// Command parameter not implemented
    AUTH_REQUIRED = 530,// Authentication required
    AUTH_FAILED = 535,// Authentication credentials invalid
    MAILBOX_UNAVAILABLE = 550,// Requested action not taken: mailbox unavailable
    USER_NOT_LOCAL = 551,// User not local; please try <forward-path>
    EXCEEDED_STORAGE = 552,// Requested mail action aborted: exceeded storage allocation
    MAILBOX_NAME_INVALID = 553,// Requested action not taken: mailbox name not allowed
    TRANSACTION_FAILED = 554,// Transaction failed
    MAIL_RCPT_PARAMETERS_INVALID = 555
}
/**
 * SMTP Command Types
 */
export declare enum SmtpCommand {
    HELO = "HELO",
    EHLO = "EHLO",
    MAIL_FROM = "MAIL",
    RCPT_TO = "RCPT",
    DATA = "DATA",
    RSET = "RSET",
    NOOP = "NOOP",
    QUIT = "QUIT",
    STARTTLS = "STARTTLS",
    AUTH = "AUTH",
    HELP = "HELP",
    VRFY = "VRFY",
    EXPN = "EXPN"
}
/**
 * Security log event types
 */
export declare enum SecurityEventType {
    CONNECTION = "connection",
    AUTHENTICATION = "authentication",
    COMMAND = "command",
    DATA = "data",
    IP_REPUTATION = "ip_reputation",
    TLS_NEGOTIATION = "tls_negotiation",
    DKIM = "dkim",
    SPF = "spf",
    DMARC = "dmarc",
    EMAIL_VALIDATION = "email_validation",
    SPAM = "spam",
    ACCESS_CONTROL = "access_control"
}
/**
 * Security log levels
 */
export declare enum SecurityLogLevel {
    DEBUG = "debug",
    INFO = "info",
    WARN = "warn",
    ERROR = "error"
}
/**
 * SMTP Server Defaults
 */
export declare const SMTP_DEFAULTS: {
    CONNECTION_TIMEOUT: number;
    SOCKET_TIMEOUT: number;
    DATA_TIMEOUT: number;
    CLEANUP_INTERVAL: number;
    MAX_CONNECTIONS: number;
    MAX_RECIPIENTS: number;
    MAX_MESSAGE_SIZE: number;
    SMTP_PORT: number;
    SUBMISSION_PORT: number;
    SECURE_PORT: number;
    HOSTNAME: string;
    CRLF: string;
};
/**
 * SMTP Command Patterns
 * Regular expressions for parsing SMTP commands
 */
export declare const SMTP_PATTERNS: {
    EHLO: RegExp;
    MAIL_FROM: RegExp;
    RCPT_TO: RegExp;
    PARAM: RegExp;
    EMAIL: RegExp;
    END_DATA: RegExp;
};
/**
 * SMTP Extension List
 * These extensions are advertised in the EHLO response
 */
export declare const SMTP_EXTENSIONS: {
    PIPELINING: string;
    SIZE: string;
    EIGHTBITMIME: string;
    STARTTLS: string;
    AUTH: string;
    ENHANCEDSTATUSCODES: string;
    HELP: string;
    CHUNKING: string;
    DSN: string;
    formatExtension(name: string, parameter?: string | number): string;
};