Mail | 
public abstract string GetMessageUid( int index, CancellationToken cancellationToken = default )
| Exception | Condition | 
|---|---|
| ArgumentOutOfRangeException | index is not a valid message index. | 
| ObjectDisposedException | The MailSpool has been disposed. | 
| ServiceNotConnectedException | The MailSpool is not connected. | 
| ServiceNotAuthenticatedException | The MailSpool is not authenticated. | 
| NotSupportedException | The mail spool does not support UIDs. | 
| OperationCanceledException | The operation was canceled via the cancellation token. | 
| IOException | An I/O error occurred. | 
| CommandException | The command failed. | 
| ProtocolException | A protocol error occurred. |