If you are really engaged in Google+, so receiving lots of email notifications, which can be little weird, so you will surely lookout to manage your email notification settings for your Google Account.
This guide will help you to customized email notifications as you want
# Login into your Google+ Account, and click on the gear icon which is at top-right side of the window
# Click on 'Google+ Setting'. It will show you settings of your Google+ account.
# In the Receive notifications section, edit the email notifications as you want.
# When done, Click 'Back to Google+' and you are done.