Customise message notifications in Drupal 7 I'm using organic groups with Drupal 7 and members receive email notifications when new content is posted to their group.

However I can't find a way to modify:

Email subject: New post in group
Email message: Hello [user], There is a new post called...


Which template or database entry do I need to modify?
OG7 Uses the Rule module for sending email notifications. See admin/config/workflow/rules/reaction/manage/rules_og_group_content_notification