Trigger - If configured, and trigger conditions are met, an email of this type will be sent upon completion of a build. Click the help button next to the trigger name to find out more about what conditions will trigger an email of this type to be sent.
Send To Recipient List - If this is checked, an email will be sent all email addresses in the global recipient list.
Send To Committers - If this is checked, an email will be sent all users who are listed under "changes" for the build. This will use the default email suffix from Jenkins's configuration page.
Send To Requester - If this is checked, an email will be sent user who triggers the build.
Include Culprits - If this is checked and Send To Committers is checked, emails will include everyone who committed since the last successful build.
More Configuration - You can change more settings for each email trigger by clicking on the "+(expand)" link.
Remove - You can remove an email trigger by clicking the "Delete" button on the row for the specified trigger.