vvrpgsporcupineorg vivek khera feb 13 2008 250 pm victor duchovni wrote yes 25 adds support perdestination rate limits really intended users soho isp msas fact major isp inbound mx host rather sad list dozen remote sites isps universities nonprofits throttle delivery im keen implementing 25 proper rate limits rather faking concurrency limits isps actually need low concurrency limits rather rate limits also pita way implemented rate limited destinations temporarily ignored scheduler delivers mail instead overall loss mail delivery performance postfix 251 rc2 days 251 official soon wietse tue 05 aug 2008 190743 0500 comcasts 6 recipient per second limit