smfi_chgheader()(3N)													      smfi_chgheader()(3N)

NAME

       smfi_chgheader() - changes or deletes a sendmail message header

SYNOPSIS

PARAMETERS

       ctx	 Specifies the opaque context structure.

       headerf	 Specifies the header name, which is a non-NULL, null-terminated string.

       hdridx	 Specifies  the  header  index	value (1-based).  A hdridx value of 1 modifies the first occurrence of a header named If hdridx is
		 greater than the number of times appears, a new copy of is added.

DESCRIPTION

       changes the value of a header for the current message.  can be called only from the routine.

   Notes
       o  While can be used to add new headers, it is more efficient to use

       o  A filter that calls must set the flag in the structure passed to

       o  The filter order is important for Filter placed later in the sequence will observer the changes already done by earlier filters.

       o  The name and the value of the header are not checked for standards compliance.  However, each line of the  header  must  be  under  2048
	  characters.	If longer headers are needed, multi-line header must be used.  To make a multi-line header, insert a linefeed (ASCII 0x0a,
	  or 
 in C) followed by at least one whitespace character, such as, a space (ASCII 0x20) or tab (ASCII 0x09, or 	 in C).  The  linefeed
	  must	not be preceded by a carriage return (ASCII 0x0d); the MTA adds this automatically.  It is the responsibility of the filter writer
	  to ensure that standards are not violated.

RETURN VALUE

       returns due to the following reasons:

       o  headerf contains a NULL value.
       o  Modifying headers in the current connection state is invalid.
       o  Memory allocation fails.
       o  Network error occurs.
       o  is not set when is called.

       returns on success.

EXAMPLES

AUTHOR

       was developed by the Sendmail Inc.

SEE ALSO

       smfi_addheader(3N), smfi_insheader(3N), smfi_addrcpt(3N), smfi_delrcpt(3N), smfi_replacebody(3N).

       on

															      smfi_chgheader()(3N)