By default, Google+ will email you notifications every time your are tagged, mentioned, followed, etc. If you don’t want to be notified this often, you can change these settings to better meet your needs.
1. Go to Google+ and login to your account.
2. Go to the upper-right corner of the page and click the Options icon 
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3. Select Google+ settings from the dropdown menu.
4. Go to the Receive notifications section and use the checkboxes (in the Email column) to select only the notifications you wish to receive, uncheck the ones you do not want to be bothered with.
