postfix mailman transport file missing

[Thufir]

when I installed mailman, I don't see a transport as described here:


Associate the domain lists.example.com to the mailman transport with the 
transport map. Edit the file /etc/postfix/transport:

lists.example.com      mailman:

https://help.ubuntu.com/community/Mailman

root at dur:~# 
root at dur:~# ll /etc/postfix/
total 120
drwxr-xr-x   3 root root  4096 Aug 26 04:21 ./
drwxr-xr-x 170 root root 12288 Aug 27 15:29 ../
-rw-r--r--   1 root root   373 Aug 14 01:44 dynamicmaps.cf
-rw-r--r--   1 root root  2092 Aug 26 04:21 main.cf
-rw-r--r--   1 root root  1280 Aug 16 23:59 main.cf.1.orig
-rw-r--r--   1 root root  3298 Aug 25 16:59 main.cf.2.mysql
-rw-r--r--   1 root root  1323 Aug 26 00:38 main.cf.3.dovecot
-rw-r--r--   1 root root  5563 Aug 14 01:43 master.cf
-rw-r--r--   1 root root   150 Aug 17 00:21 mysql_alias.cf
-rw-r--r--   1 root root   150 Aug 17 00:22 mysql_domains.cf
-rw-r--r--   1 root root   150 Aug 17 00:21 mysql_mailbox.cf
-rw-r--r--   1 root root 19707 Apr 13 13:33 postfix-files
-rwxr-xr-x   1 root root  8729 Oct  6  2011 postfix-script*
-rwxr-xr-x   1 root root 26498 Apr 13 13:33 post-install*
drwxr-xr-x   2 root root  4096 Apr 13 13:33 sasl/
root at dur:~# 


what does it mean that the file is missing?



thanks,

Thuifr