Action Hook: Fires after the sending of the notification to new users for successful registration with blog.

Action Hook: Fires after the sending of activation email to a newly registered user.

Action Hook: Fires after the sending of a reply to a reply email notification.

Action Hook: Fires after the sending of a reply to an update email notification.

Filter Hook: Filters the message notification message that will be sent to user.

Filter Hook: Filter the email text sent when a user changes emails.

Filter Hook: Filters the message notification subject that will be sent to user.

Filter Hook: Filters the group membership request result message that will be sent to user.

Filter Hook: Filters the user email that the message notification will be sent to.