Dear Khun Nararat
In normally case mail server allowed user to send e-mail out 100 copys/12Hr.
We must to limit amount of sending quota, Because we want to protect user send SPAM mail out.
If we allowed too much . If some account was hacked, Our IP will be in blacklist.
So we can't increase sending quota to all accounts. We apologize for inconvenience.
But if some account want to increase sending quota, Please specify account and let us know.