Jason,
It's a more advanced setting. By default, it sends 3 emails and then waits 1 second.
Open up mm_mail.pl
Find this:
Code:
# Pause, as not to hurt the server
if ($i % 3 == 0) {
sleep(1);
}
You can then change the number 3 to something different (lower would make it slower). Or you could change the 1 in the sleep command to be higher, so if you change it to a 5, it will wait 5 seconds before sending 3 more emails.
I hope that helps.
Carrie