xxfi_unknown callback Function

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Purpose

The xxfi_unknown callback function handles the unknown and unimplemented simple mail transfer protocol (SMTP) commands.

Syntax

#include <libmilter/mfapi.h>
sfsistat (*xxfi_unknown)(
	SMFICTX *ctx,
	const char *arg
);

Description

The xxfi_unknown callback function is called when the client uses an SMTP command that is either unknown or not implemented by the mail transfer agent (MTA) and returns the SMFIS_CONTINUE flag.

Note: The server always rejects the SMTP command. It is only possible to return a different error code.

Arguments

Table 1. Arguments
Item Description
ctx The opaque context structure is maintained in the libmilter parameter.
arg The SMTP command including all arguments.

Return values

Table 2. Return Values
Item Description
SMFIS_TEMPFAIL The command is rejected with a temporary error.
SMFIS_REJECT The command is rejected.