aports/config/rspamd/modules/ratelimit.conf

ratelimit {
	rates {
		to_ip_from = {
			bucket = {
				rate = "10 / 1m";
				burst = 50;
			}
		}
	}
	whitelisted_rcpts = "postmaster,mailer-daemon";
	max_rcpt = 25;
	info_symbol = "RATELIMITED";
}