[exim] how to block spammeur with exim

Hello,
I've a big problem with a spammer. He send lot of messages everyday
and I've trying to configure the filter options but it doesn't match.
There is my parameters:
smtp_accept_max = 25
smtp_accept_max_per_connection = 50
smtp_accept_max_per_host = 10
smtp_accept_reserve = 4
How can I adjust to block it or limit the max connexion?