There is global configuration. Go to Manage Hudson, then Configure System (the wording my be different based on your version, but you should end up here http://<hudsonurl>/configure
. You need to have global administrative permissions to access this, but based on what you are saying, it sound like you do not.
Based on your version of the plugin, under Extended E-mail Notification, you will see Default Recipients. Older versions of the plugin did not have that feature.
Also, under the job configuration itself, there are several places to override/add to the list of recipients, the most buried of which is under the Triggers
- Click Advanced... button under Editable Email Notification
- For each trigger, click Expand link.
Lastly, it is possible that people are included on the emails cause they were Culprits. In Hudson's terms, these are people who committed to SCM since the last successful build. If the build has been failing since then for a long time, they are just there as culprits. The only way to "reset" the culprits is to let the job build successfully