block email domain and user specific

hi guy

A) How can you block a domain list?

I have about 200 domains that always send spam, and I want to block all senders from that list. How to block a list of domains?.


B) How can you block a email account specific list?
I have identified hotmail and gmail email users who always send spam, there are like 500. How can I block specific email users?

Also looking for an answer on this...

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

cwp has already black/white list files
http://wiki.centos-webpanel.com/postfix-blacklist-domain-or-ip

It would be nice if they added to the user panel
mail blacklist or reject an email address