I am trying to limit the number of send/receive attempt done by my user to postfix server in time unit. Eg, i want the postfix to process each user's connection once in 60s.
As currently, my user keep clicking on the send/receive button in their email client, it can be 10 times just in a sec.
I have tried to use smtpd_client_connection_rate_limit = 60
but it does not work, postfix still process the user request.