[exim] sender domain deny acl_check_rcpt (Help requested) (e…

I would like to deny mails from a particular domain. Here is what I have
done so far however it doesn't work and I am wondering is there is a
better way to make it work.

domainlist blacklist_domains = domain.com

acl_check_rcpt:

deny message = This domain is not allowed to send mail here. 
        senders = blacklist_domains

Carinus