Files referenced using the 
:include:
 syntax have the same syntax as 
~/.forward
 files. Any files written via a 
:include:
 file must be writable by the owner of the 
:include:
 file, and any other 
:include:
 files referenced for inclusion must be readable by the owner of the referencing  
:include:
 file.
To set up a mailing list managed by, for example, sally , set up the following aliases:
sample: :include:/var/lists/sample.list sample-request: sally owner-sample: sample-request
Then create the file /var/lists/sample.list , mode 644, and owned by sally . Mail sent to sample will be sent to everyone on the list. Error messages will go directly to sample-request , and in turn to sally . (The list-request syntax is an Internet convention, see §25.2.)