$maxspam = 10; 
# Maximum emails classified as spam, which can be sent by the user per 8 hours
$maxbulk = 20; 
# Maximum emails classified as bulk/valid-bulk, which can be sent by the user per 8 hours
$maxmsg = 150; 
# Maximum number of messages which one email address can send per hour
$maxgmail = 5; 
# Maximum number of messages which one email address can send to *@gmail.com per 80 seconds. This was done to prevent rate limiting of our IPs from Google side.
$maxqueued = 50; 
# Maximum number of queued emails per 1 email address
$maxfailures = 10; 
# Maximum number of failed deliveries per hour(this was done to prevent blind spamming).