--- a/doc/user_guide.txt	Sat Jan 11 23:52:28 2003 +0000
+++ b/doc/user_guide.txt	Sun Jan 12 00:03:11 2003 +0000
@@ -2,7 +2,7 @@
 User Guide
 ==========
 
-:Version: $Revision: 1.12 $
+:Version: $Revision: 1.13 $
 
 .. contents::
 
@@ -302,6 +302,51 @@
 to determine if they get a nosy list copy of the message too.
 
 
+Mail gateway script command line
+--------------------------------
+
+The roundup mail gateway may be called in one of three ways:
+
+ . with an instance home as the only argument,
+ . with both an instance home and a mail spool file, or
+ . with both an instance home and a pop server account.
+ 
+It also supports optional -C and -S arguments that allows you to set a
+fields for a class created by the roundup-mailgw. The default class if
+not specified is msg, but the other classes: issue, file, user can
+also be used. The -S or --set options uses the same
+property=value[;property=value] notation accepted by the command line
+roundup command or the commands that can be given on the Subject line
+of an email message.
+
+It can let you set the type of the message on a per email address basis.
+
+PIPE:
+ In the first case, the mail gateway reads a single message from the
+ standard input and submits the message to the roundup.mailgw module.
+
+UNIX mailbox:
+ In the second case, the gateway reads all messages from the mail spool
+ file and submits each in turn to the roundup.mailgw module. The file is
+ emptied once all messages have been successfully handled. The file is
+ specified as::
+
+   mailbox /path/to/mailbox
+
+POP:
+ In the third case, the gateway reads all messages from the POP server
+ specified and submits each in turn to the roundup.mailgw module. The
+ server is specified as::
+    pop username:password@server
+
+ The username and password may be omitted::
+    pop username@server
+    pop server
+
+ are both valid. The username and/or password will be prompted for if
+ not supplied on the command-line.
+
+
 Command Line Tool
 =================