| SYNOPSIS | 
#include <libmilter/mfapi.h>
sfsistat (*xxfi_unknown)(
	SMFICTX *ctx,
	const char *arg
);
Handle unknown and unimplemented SMTP commands. | 
|---|
| DESCRIPTION | 
| Called When | xxfi_unknown is called when the client uses an SMTP command
that is either unknown or not implemented by the MTA. |  
| Default Behavior | Do nothing; return SMFIS_CONTINUE. |  | 
|---|
| ARGUMENTS | 
    | Argument | Description | 
|---|
 | ctx | Opaque context structure. |  | arg | SMTP command including all arguments. |  | 
|---|
| SPECIAL RETURN VALUES | 
  | Return value | Description | 
|---|
 
     | SMFIS_TEMPFAIL | Reject this command with a temporary error. |  
     | SMFIS_REJECT | Reject this command. |  | 
| NOTES | The SMTP command will always be rejected by the server,
it is only possible to return a different error code. |