This page contains the options for setting the default rate and concurrency limits for all Postfix components. These rates can usually be overridden within their respective configuration sections.
This option specifies the maximum number of deliveries that Postfix will perform to the same destination simultaneously. This option correlates to the default_destination_concurrency_limit directive and defaults to 10.
Limits the number of recipients per delivery. This option correlates to the default_destination_recipient_limit directive and defaults to 50.
Specifies the initial number of simultaneous deliveries to the same destination. This limit applies to all SMTP, local, and pipe mailer deliveries. A concurrency of less than two could lead to a single problem email backing up delivery of other mail to the same destination. This option configures the initial_destination_concurrency directive and defaults to 5.
Defines the number of days a message will remain queued for delivery in the event of delivery problems before the message is sent back to the sender as undeliverable. This option configures the maximal_queue_lifetime directive and defaults to 5 days.
In the event of a delivery deferral, Postfix will wait the specified amount of time before reattempting delivery. This value also specifies the time an unreachable destination will remain in the destination status cache. This option correlates to the minimal_backoff_time directive and defaults to 1000 seconds.
Specifies the maximum amount of time between delivery attempts in the event of a deferred delivery. This option configures the maximal_backoff_time directive and defaults to 4000 seconds.
Specifies the time in seconds between queue scans by the queue management task. This option correlates to the queue_run_delay and defaults to 1000 seconds.
This field specifies which delivery transports, if any, of the transports defined in the Transport Mapping section will not have their messages sent automatically. Instead the messages for these transports will be queued and can be delivered manually using the sendmail -q command. This option correlates to the defer_transports directive and contains nothing by default.