How to block email address domain

Hi all, I am trying to block all emails from amazon from being received to all mail boxes.
Under Email > Global filters > Content filter - I have added <.+?(@|@.*.)amazon.com> under Regexp. Pattern, then Action DISCARD, did not work.
So I tried under Postfix blacklist > *@amazon.com as Sender, did not work.
Probably missing something obvious here but just cant figure it out.
Thank all

 

This was discussed before so try reading this thread: https://www.howtoforge.com/community/threads/block-entire-top-level-domain.88354/#post-431854

 

Thanks but I dont want to block TLD's, specifically emails from amazon sites.

 

I have also tried <.+?(@|@.*\.)amazon\.com> which does not work, one thing I noticed, usually when I make a change to ISPconfig there is red flashing 1 circle at the top, this is not happening with these changes?

 

This works
https://www.cyberciti.biz/faq/howto-blacklist-reject-sender-email-address/