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Search for Block Sender for Gmail in the Google Chrome App Store.
You can download Block Sender by pressing the "free" button here.
Then press add on the extension popup. Then afterwards
your Gmail account will automatically have Block Sender added.
Next, you can block your first message.
When reading a message, you will see a block button. Which
when you click the button
the message will get blocked. It's that easy.
The Undo message will show for a few seconds
if you change your mind. Then afterwards, the filters are automatically created.