update user list details

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@14919 ee4ac58c-ac51-4696-9907-e4b3aa274f04

docs/intro_chapter.sgml

@@ -123,7 +123,7 @@ LINKEND="RUNNINGPC"> .
     <PARA> 
 We welcome contributions to &prog;, bug reports from users and suggestions for
 new features.  An email discussion list has been set up for this purpose.  To
-join, send a message to 'majordomo@sanger.ac.uk' with 'subscribe
+join, send a message to 'artemis-users-join@sanger.ac.uk' with 'subscribe
 artemis-users' in the body (not the subject).  Announcements will also be sent
 to this list.
     </PARA>