You can enable the email notification as explained here38.
You can enable notification for one group as explained here24.
Here is the list of events you will receive a notification for74.
Here is how you can prevent emails from ending up in spam90.
Here is how you as a user can change the frequency of the email you receive21.
Here is how you can invite someone to the community36 using an email invitation.
Here is how you can send a welcome email32.