namespace System.Net.Mail
{
    public enum SmtpStatusCode
    {
        SystemStatus = 211,
        HelpMessage = 214,
        ServiceReady = 220,
        ServiceClosingTransmissionChannel = 221,
        Ok = 250,
        UserNotLocalWillForward = 251,
        CannotVerifyUserWillAttemptDelivery = 252,
        StartMailInput = 354,
        ServiceNotAvailable = 421,
        MailboxBusy = 450,
        LocalErrorInProcessing = 451,
        InsufficientStorage = 452,
        ClientNotPermitted = 454,
        CommandUnrecognized = 500,
        SyntaxError = 501,
        CommandNotImplemented = 502,
        BadCommandSequence = 503,
        MustIssueStartTlsFirst = 530,
        CommandParameterNotImplemented = 504,
        MailboxUnavailable = 550,
        UserNotLocalTryAlternatePath = 551, //handled internally
        ExceededStorageAllocation = 552,
        MailboxNameNotAllowed = 553,
        TransactionFailed = 554,
        GeneralFailure = -1,
    }
}