To close a mailing list within Sympa, this is what you need to do :
Log in to https://lists.ncl.ac.uk/
Firstly, you need to locate the list you wish to request closed in
the Your Lists menu on the left...(as listowner, you should see a red Admin button to the left of
the list's name
- click this button) :
BE CAREFUL however, if the list you are intending to remove is a sub-list of an existing superlist, you may wish to firstly consider consulting with the owner of the superlist before continuing. Removing a sub-list will affect the membership of any superlists they are associated with.
The List Operations menu will appear on the left hand side - select
Admin->Remove list :
A dialog box will appear asking for you to confirm the list removal. Click OK to confirm, otherwise Cancel