How to block a message sender?

When You receive a new message, You have an opportunity to apply any filter to sender straight in the message reading view. To do that:

open the message;
click on the name of sender;
in the drop-down menu choowse option "Create a filter".

After this You'll get redirected to the "Options" section, where You are able to finish adding any filter to the certain sender.
More about filters - here.

Tags: spam