text_combined: bqkxbroundspherecom done lot research going docs searching archives cant get arms around one work company sends legitimate special offers products people signed receive spam anyway recently comcast implemented new policy receive messages stay 6 recipients per second defer go following set settings postfix version 225 solaris 9 mastercf comcast unix n 1 smtp smtp_connect_timeout5 smtp_helo_timeout5 maincf comcast_destination_recipient_limit 1 comcast_destination_concurrency_limit 4 comcast_initial_destination_concurrency 2 transport comcastnet comcast comcastcom comcast rebuilding transport file restarting postfix still see logs hitting servers missing need upgrade 25 higher get functionality need thanks kevin heres link comcasts policy httpwwwcomcastnethelpfaqindexjspfaqsecuritymail_policy19161 tue 05 aug 2008 220027 0700 comcasts 6 recipient per second limit