Is there any of limit the numbers of recipients in a single messagem in qmailtoaster? I used to set it in tarpitcount but i haven't seem anything exactly like this in spamthrotle.
Spam throttle looks at the max number of recipients within a time period, regardless of how many connections are made (you can easily get around the tarpit limit by creating multiple smtp connections, that's why it is no longer used).
Regards,
Bill