Blacklisting Senders
If you wish to not recieve email notifications for certain senders, you can add said senders to the sender blacklist on a per email account basis.
Blacklisting a sender
Firstly, Navigate to the Manage Sender Blacklist option of your desired email account.

Next, press the + button on the right.

Finally, specify the sender you wish to blacklist, and press the Add button.

Congratulations! If you completed the previous steps successfully, you will no longer recieve email notifications for the senders that you blacklist.