Yes, Hestia does. Exim4 (mail server) uses two block lists to reject mails from listed ips. The lists are; bl.spamcop.net and zen.spamhaus.org
If you want to remove spamcop, edit file /etc/exim4/dnsbl.conf, remove bl.spamcop.net, save the file and restart exim.
systemctl restart exim4