mailcow/data/conf/rspamd/local.d/ratelimit.conf

rates {
  # Limit for all mail per recipient (burst 100, rate 2 per minute)
  to = [100, 0.033333333];
  # Limit for all mail per one source ip (burst 30, rate 1.5 per minute)
  to_ip = [30, 0.025];
  # Limit for all mail per one source ip and from address (burst 20, rate 1 per minute)
  to_ip_from = [20, 0.01666666667];
  # Limit for all bounce mail (burst 10, rate 2 per hour)
  bounce_to = [10, 0.000555556];
  # Limit for bounce mail per one source ip (burst 5, rate 1 per hour)
  bounce_to_ip = [5, 0.000277778];
  # Limit for all mail per authenticated user (burst 20, rate 1 per minute)
  user = [20, 0.01666666667];
}
# If symbol is specified, then it is inserted instead of setting result
#symbol = "R_RATELIMIT";
whitelisted_rcpts = "postmaster,mailer-daemon";
max_rcpt = 5;