rspamd/conf/modules.d/ratelimit.conf

# Please don't modify this file as your changes might be overwritten with
# the next update.
#
# You can modify '$LOCAL_CONFDIR/rspamd.conf.local.override' to redefine
# parameters defined on the top level
#
# You can modify '$LOCAL_CONFDIR/rspamd.conf.local' to add
# parameters defined on the top level
#
# For specific modules or configuration you can also modify
# '$LOCAL_CONFDIR/local.d/file.conf' - to add your options or rewrite defaults
# '$LOCAL_CONFDIR/override.d/file.conf' - to override the defaults
#
# See https://rspamd.com/doc/tutorials/writing_rules.html for details

ratelimit {
    #rates {
        # Predefined ratelimit
        #to = {
        #  bucket = {
        #    burst = 100;
        #    rate = 0.01666666666666666666; # leak 1 message per minute
        #  }
        #}
        # or define it with selector
        #other_limit_alt = {
        #  selector = 'rcpts:addr.take_n(5)';
        #  bucket = {
        #    burst = 100;
        #    rate = "1 / 1m"; # leak 1 message per minute
        #  }
        #}
    #}
    # If symbol is specified, then it is inserted *instead* of setting result to soft reject
    #symbol = "R_RATELIMIT";

    # If info_symbol is specified, then it is inserted next to set the result
    #info_symbol = "R_RATELIMIT_INFO";

    whitelisted_rcpts = "postmaster,mailer-daemon";
    max_rcpt = 5;

    .include(try=true,priority=5) "${DBDIR}/dynamic/ratelimit.conf"
    .include(try=true,priority=1,duplicate=merge) "$LOCAL_CONFDIR/local.d/ratelimit.conf"
    .include(try=true,priority=10) "$LOCAL_CONFDIR/override.d/ratelimit.conf"
}