freebsd 9.0 postfix 2.10 we have:
master.cf orange unix - - n - 1 smtp and transport.map orange.fr orange: wanadoo.fr orange: main.cf postconf | egrep destination | egrep -iv '\$' default_destination_concurrency_failed_cohort_limit = 1 default_destination_concurrency_limit = 1 default_destination_concurrency_negative_feedback = 1 default_destination_concurrency_positive_feedback = 1 default_destination_rate_delay = 60s default_destination_recipient_limit = 1 destination_concurrency_feedback_debug = no initial_destination_concurrency = 1 but smtp orange.fr still rejecting at a rate of about every 5 to 7 seconds: status=deferred (delivery temporarily suspended: host smtp-in.orange.fr[193.252.22.65] refused to talk to me: 421 mwinf5c21 ME Service refuse. Veuillez essayer plus tard. Service refused, please try later. OFR_999 [999]) thanks Len
