The default amount of delay that is inserted between individual deliveries to the same destination; with per-destination recipient limit > 1, a destination is a domain, otherwise it is a recipient.
To enable the delay, specify a non-zero time value (an integral value plus an optional one-letter suffix that specifies the time unit).
Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is s (seconds).
NOTE: the delay is enforced by the queue manager. The delay timer state does not survive "postfix reload" or "postfix stop".
Use transport_destination_rate_delay to specify a transport-specific override, where transport is the master.cf name of the message delivery transport.
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看到这个，
你可以使用
default_recipient_limit
qmgr_message_recipient_limit
default_destination_rate_delay
在同一目的地的各个交付之间插入的默认延迟量；每个目的地收件人限制 > 1、目的地是一个域，否则就是一个接收者。
要启用延迟，请指定一个非零时间值（整数值加上指定时间单位的可选单字母后缀）。
时间单位：s（秒）、m（分钟）、h（小时）、d（天）、w（周）。默认时间单位为 s（秒）。
注意：延迟是由队列管理器强制执行的。延迟计时器状态不会在“后缀重新加载”或“后缀停止”中保留。
使用transport_destination_rate_delay 指定特定于传输的覆盖，其中transport 是消息传送传输的master.cf 名称。
Postfix 2.5 及更高版本中提供了此功能。
http://www.postfix.org/postconf.5.html
see this,
you can play around with
default_recipient_limit
qmgr_message_recipient_limit
default_destination_rate_delay
The default amount of delay that is inserted between individual deliveries to the same destination; with per-destination recipient limit > 1, a destination is a domain, otherwise it is a recipient.
To enable the delay, specify a non-zero time value (an integral value plus an optional one-letter suffix that specifies the time unit).
Time units: s (seconds), m (minutes), h (hours), d (days), w (weeks). The default time unit is s (seconds).
NOTE: the delay is enforced by the queue manager. The delay timer state does not survive "postfix reload" or "postfix stop".
Use transport_destination_rate_delay to specify a transport-specific override, where transport is the master.cf name of the message delivery transport.
This feature is available in Postfix 2.5 and later.
http://www.postfix.org/postconf.5.html