convert_msg_header() fixes:

Reference the header field name (f) correctly (copy/pasted "line" from
newsutil.js).
Removed unnecessary reassignment of header field array element.
Return newly created object instead of adding properties to passed array.
Can you tell I'm not actually testing these modifications? :-)

exec/load/mailproc_util.js

@@ -31,10 +31,12 @@ function parse_msg_header(msgtxt)
 }
 
 // Convert a parsed RFC822 message header field array into a Synchronet-compatible header object
-function convert_msg_header(hdr)
+function convert_msg_header(hdr_array)
 {
-	for(f in hdr) {
-		var data = hdr[f];
+	var hdr = new Object;
+
+	for(f in hdr_array) {
+		var data = hdr_array[f];
 		switch(f) {
 			case "to":
 			case "apparently-to":
@@ -101,10 +103,9 @@ function convert_msg_header(hdr)
 					hdr.field_list=new Array();
 				hdr.field_list.push(
 					{	type: RFC822HEADER, 
-						data: line + ": " + data 
+						data: f + ": " + data 
 					}
 				);
-				hdr[line.toLowerCase()]=data;
 				break;
 		}
 	}