Pop | 
public override Task AuthenticateAsync( SaslMechanism mechanism, CancellationToken cancellationToken = default )
| Exception | Condition | 
|---|---|
| ArgumentNullException | mechanism is . | 
| ObjectDisposedException | The Pop3Client has been disposed. | 
| ServiceNotConnectedException | The Pop3Client is not connected. | 
| InvalidOperationException | The Pop3Client is already authenticated. | 
| OperationCanceledException | The operation was canceled via the cancellation token. | 
| AuthenticationException | Authentication using the supplied credentials has failed. | 
| SaslException | A SASL authentication error occurred. | 
| IOException | An I/O error occurred. | 
| Pop3CommandException | A POP3 command failed. | 
| Pop3ProtocolException | An POP3 protocol error occurred. | 
Authenticates using the specified SASL mechanism.
For a list of available SASL authentication mechanisms supported by the server, check the AuthenticationMechanisms property after the service has been connected.