Postfix has no bit-rate controls. If you want to reduce Postfix
network bitrates, then use traffic shaping in your TCP/IP stack.
If you want to limit the mail volume to a Yahoo etc., use Postfix
built-in concurrency limits. Configure dedicated SMTP clients in
master.cf for Yahoo etc. and use reduced concurrency limit etc.
values.
/etc/postfix/master.cf:
yahoo unix - - n - - smtp
/etc/postfix/main.cf:
yahoo_destination_concurrency_limit = 1
yahoo_destination_rate_delay = 1
yahoo_destination_recipient_limit = whatever
Wietse
