message-subscribed-address-file

message-subscribed-address-file is a variable defined in `message.el'.
Its value is

nil

Documentation:
*A file containing addresses the user is subscribed to.
If nil, do not look at any files to determine list subscriptions. If
non-nil, each line of this file should be a mailing list address.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.