how to block all mails which came from .icu(e.g extensions.

i am getting somany spams coming .icu extensions. Today i block on domain then tomorrow they are coming another domain with icu extension. Can anyone help me to block specific extension

You can create a Rule to do this.

Go to Menu > Tools > Rules, and select New Rule.

Choose Apply Custom Rule on messages I receive.

Select the with words found in the header option.

Click on the words link and type in: From: .icu

Note the colon and period, so type it exactly as in bold above.

Click on Add and then OK.

Your Rule should look like this:

Click on Finish.

Now any email from the .icu domain will go to the Junk Email folder.