Personally I keep my lists on a Spreadsheet (in Libre Office) and also synched to Google Drive. Benefits are:-
One List, updateable from anywhere, synched across desktop (Win8), Chromebook, and Android phone.
Sortable, so I can pick out just computer club, amdram group, and various other categories (or can be kept in different sheets in the one file).
Sending out an email takes a single swipe up the email column, then paste into a bcc in Thunderbird (or anything else that may be in use).
Result Nirvana one full list with full details - rather than a list for this purpose here - a list for that purpose there, etc.