How to limit amount of messages per time unit in Postfix

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Open postfix config file
#nano /etc/postfix/main.cf

And add next rows

smtpd_client_event_limit_exceptions = 
#Clients that are excluded from connection count (default: $mynetworks)

anvil_rate_time_unit = 60s 
#The time unit over which client connection rates and other rates are calculated. (default: 60s)

anvil_status_update_time = 120s 
#How frequently the server logs peak usage information. (default: 600s)

smtpd_client_message_rate_limit=500 
#The maximal number of message delivery requests that any client is allowed to make to this service per time unit. (default: 0) To disable this feature, specify a limit of 0.

This configuration means that client may send 500 messages per minute, message 501 will be rejected.

Ref:

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