Throttling not getting updated for new user

==== Required information ====
- iRedMail version: 0.8.4
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): 1.8.1
- Linux/BSD distribution name and version: CentOS 6.2
- Related log if you're reporting an issue:
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Hi All,

I have enabled domain wise throttling for sender and while testing whenever creating user to that domain throttling not getting enabled by default. How can i make it enabled by default ?

Thanks,
Khanb