RecipientCommand.cs

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namespace System.Net.Mail;
 
internal static class RecipientCommand
{
    internal static IAsyncResult BeginSend(SmtpConnection conn, string to, AsyncCallback callback, object state)
    {
        PrepareCommand(conn, to);
        return CheckCommand.BeginSend(conn, callback, state);
    }
 
    private static bool CheckResponse(SmtpStatusCode statusCode, string response)
    {
        switch (statusCode)
        {
        case SmtpStatusCode.Ok:
        case SmtpStatusCode.UserNotLocalWillForward:
            return true;
        case SmtpStatusCode.MailboxBusy:
        case SmtpStatusCode.InsufficientStorage:
        case SmtpStatusCode.MailboxUnavailable:
        case SmtpStatusCode.UserNotLocalTryAlternatePath:
        case SmtpStatusCode.ExceededStorageAllocation:
        case SmtpStatusCode.MailboxNameNotAllowed:
            return false;
        default:
            if (statusCode < (SmtpStatusCode)400)
            {
                throw new SmtpException(System.SR.net_webstatus_ServerProtocolViolation, response);
            }
            throw new SmtpException(statusCode, response, serverResponse: true);
        }
    }
 
    internal static bool EndSend(IAsyncResult result, out string response)
    {
        SmtpStatusCode statusCode = (SmtpStatusCode)CheckCommand.EndSend(result, out response);
        return CheckResponse(statusCode, response);
    }
 
    private static void PrepareCommand(SmtpConnection conn, string to)
    {
        if (conn.IsStreamOpen)
        {
            throw new InvalidOperationException(System.SR.SmtpDataStreamOpen);
        }
        conn.BufferBuilder.Append(SmtpCommands.Recipient);
        conn.BufferBuilder.Append(to, allowUnicode: true);
        conn.BufferBuilder.Append(SmtpCommands.CRLF);
    }
 
    internal static bool Send(SmtpConnection conn, string to, out string response)
    {
        PrepareCommand(conn, to);
        SmtpStatusCode statusCode = CheckCommand.Send(conn, out response);
        return CheckResponse(statusCode, response);
    }
}