SmtpStatusCode.cs

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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,
    ExceededStorageAllocation = 552,
    MailboxNameNotAllowed = 553,
    TransactionFailed = 554,
    GeneralFailure = -1
}