You use email to sign up for a Facebook account, it's annoying that emails often receive lots of notifications from facebook. And you want to unsubscribe email notifications from facebook.
Refer to the article below on how to unsubscribe email notifications from facebook.
Step 1: First you need to login facebook account.
Step 2: Next you select the triangle icon in the upper right and select Settings .
Step 3: Select the Notifications item in the left menu.
Step 4: In the Notification section , select Edit next to Email.
Step 5: In the Email section you choose to click on the Only notifications for account, security and privacy as shown below.
A message appears, press Disable .
With just the simple steps, you have unsubscribed from email notifications from facebook. From now on you will not receive any email notification from facebook except for notifications related to your facebook account. Good luck!