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Search for block Sender for Gmail in the Google Chrome App Store
You can download it by pressing the FREE button here.
It is added, then afterwards
your Gmail account will automatically have Block Sender added.
Once it's been added, you can block the first message!
When reading your message, you will see this button which
As it says, click the button and
the message at the bottom. It's that easy
The undo message with appear for a few seconds so you can change your mind.
Afterwards the filter is created.
Search for Block Sender for Gmail in the Google Chrome
App Store