kevin pendleton bqkxbroundspherecom victor duchovni wrote specifically isp gives immediate 421 banner ehlohelo negative feedback concurrency overshoot make sticky subsequent blackout time new connections postfix 25 converge isps limits right feedback settings unfortunately comcast follows 4 hour blackout exceed limits follow able create ticket talk tech customer security assurance department apparently charge blocks number 8563177272 good luck trying find site also gave 48 hour window wont block exceeding limits get current campaign work technician future mailings also heres list outbound servers someone else asked httpsecuritycomcastnetgethelpcomcastpostmasterpageaspx thanks everyone help kevin tue 05 aug 2008 171520 0700 comcasts 6 recipient per second limit